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29 January 2020 Comparison Between Larval Survey Index and Positive Ovitrap Index in the Evaluation of Populations of Aedes (Stegomyia) aegypti (Linnaeus, 1762) North of Paraná, Brazil
Kauani Larissa Campana Nascimento, João Fernando Marques da Silva, João Antonio Cyrino Zequi, José Lopes
Author Affiliations +

Aedes (Stegomyia) aegypti (Linnaeus, 1762) is one of the world’s most widely distributed mosquitoes and is the vector of the dengue virus, one of the most important reemerging diseases. Besides dengue, A. aegypti can also transmit urban yellow fever, chikungunya, and Zika virus, making it of great medical importance. Thus, it is of extreme importance to find reliable methods to evaluate the presence of A. aegypti in urban areas. In Brazil, rapid index surveys of Aedes aegypti by means of larval survey (LIRAa) is the official method to estimate the Breteau (BI) and property infestation (PII) indexes, which indicates how many infested containers with larvae of A. aegypti were found by the total number of properties surveyed and the proportion of houses infested, respectively. As the LIRAa requires access to private residences and trained personal to find breeding sites and do not reveal the mosquito’s presence when in low density, it has not demonstrated efficacy in determining the presence of A. aegypti. To evaluate an alternative method, the LIRAa method was compared with an oviposition trap, made with hay infusion and a hardboard pallet, to evaluate the BI and the PII. The 2 methods were carried out simultaneously through 4 surveys, sampling 60 homes per survey. To evaluate the best configuration of ovitraps for surveillance of A. aegypti, the ovitraps were installed in intradomicile and peridomicile areas, with 1 to 5 traps per residence and with 1 to 3 pallets per trap, and these different configurations were compared using the positive ovitrap index (POI) and egg density index (EDI). The ovitraps showed greater sensitivity for detecting the presence of A. aegypti, with a BI of 72.5% and PII of 54.2%, whereas the LIRAa revealed only 2.1% for the BI and 1.3% for the PII. Therefore, the use of sentinel traps can provide information in a more rapid and precise manner. As there were no differences in the ovitraps distributions patterns, the ovitraps can be installed in the peridomicile area, with 2 traps per surveillance point and 1 pallet per trap, making their installation easier and more cost-efficient, facilitating the work of health agents in future surveillances complementing LIRAa’s actions for efficient monitoring.


Dengue is an arbovirosis that appears to be one of the most important reemerging diseases in the world.1 The causal agent of the disease is an arbovirus of the genus Flavivirus, belonging to the family Flaviviridae, with 4 known sorotypes: DENV-1, DENV-2, DENV-3, and DENV-4. Humans are the source of infection and the vertebrate reservoir.1 Some mosquitoes in the genus Aedes are the vectors of the etiological agent, where Aedes (Stegomyia) aegypti (Linnaeus, 1762), the most important in transmission, can also cause urban yellow fever.

In Brazil, in recent years, A. aegypti gained more prominence after it was proven that in addition to dengue, the mosquito still transmits chikungunya and Zika virus, registering the first cases in 20142 and 2015,3 respectively. Confirmation of autochthonous transmission occurred in the country as of April 2015, and 18 states with the virus.4 A. aegypti can use artificial breeding sites for oviposition, originating from anthropic activity, represented mainly by containers that allow the accumulation of water and are located around or inside homes,5,6 and expanded throughout the national territory and affecting increasing numbers of people each year.4 Díaz-González et al7 verified that about 22% of the captured A. aegypti present infection by the chikungunya virus. The microcephaly relationship caused by Zika virus in the northeast region of the country was established. The cases of microcephaly in Brazil were 1434 cases confirmed according to data from the epidemiological report up to May 21, 2016.8,9

Aedes aegypti is the exclusive vector of dengue virus and of urban yellow fever virus in Brazil.10 Since 1986, from a large epidemic that reached the metropolitan region of Rio de Janeiro, cases of dengue are continuously registered in almost all Brazilian states. This expansion of dengue fever reached national proportions thanks to the rapid spread of A. aegypti.11

Therefore, dengue is featured as the most important arbovirosis in the world, with approximately half of the global population at risk, where 50 to 100 million cases per year are estimated, in more than 100 endemic countries, which corresponds to an increase of more than 30 times the number of cases registered annually during the last 50 years.1 This marked increase has been of concern for society and health authorities, due to the difficulties with the control of epidemics and care of individuals affected by dengue.12

To evaluate the presence and abundance of A. aegypti and Aedes albopictus, the Ministry of Health of Brazil carries out larval surveys as an official method, where the Breteau and property indices are obtained.13 A. albopictus is abundant in areas with vegetation near reside, also known as periurban areas.6 Vega-Rúa et al14 verified that both species, A. aegypti and A. albopictus, were able to transmit all 3 genotypes of chikungunya and reached alarming rates in Asia and Africa, thus the spread and establishment of chikungunya in the Americas presents as an imminent risk. The indices take into consideration the number of homes visited and the presence or absence of larvae.15 Even having operational difficulties, such as access to residents’ homes, locating the cryptic breeding site such as gutters, tree holes among others, the results obtained by these indices guided the control of the vector.

The principal method in the control of A. aegypti in Brazil is the elimination of previously determined infestation. The health agents of endemics pay periodic visits to urban buildings, where they locate and eliminate breeding sites; they use larvicides or adulticides for the reduction of the vector.15 In this strategy of eliminating breeding sites, little efficacy was observed, because in Brazil, there is a growing number of epidemics of dengue in all the country.16 In 2011, about 764 032 cases of dengue were registered in Brazil, of which 35 438 cases were in Paraná.17 According to the Ministry of Health, in 2012, in Brazil, there were about 591 384 cases of dengue, where 5398 cases were in the state of Paraná. In 2019 Brazil recorded 1,439,471 probable cases of dengue between the epidemiological weeks (1 to 34); an increase of 599.5% over the same period last year.55

The larval surveys are questioned as the method of evaluation of A. aegypti, because when the levels of the infestation of the vector are low, they do not reveal its presence.13 Thus, the use of alternative and additional methods has become necessary. The use of traps for oviposition (ovitraps) is a method of collecting eggs that provides an evaluation of the density of A. aegypti, because they attract gravid females for oviposition, also making it possible to eliminate eggs from the environment.18-20

Ovitraps appear to be efficient in studies for the detection of Aedes,6,21-24 because they detect the vector at low densities; it is also a more economic method than larval survey.23,25,26 Chadee et al,27 in studies with ovitraps in the peridomicile area, found that about 80% of eggs collected were on the pallets (flat and rough wood blade on 1 side) inside the ovitraps tested. Focusing on using ovitraps in field studies aimed at corroborating the data on the reproductive biology of A. aegypti, the objectives of this work were to study aspects of the oviposition of this vector, to compare the indices obtained using the ovitraps with the larval survey, to determine the number of sentinel ovitraps necessary per home, to evaluate the ideal number of pallet per trap for determining a reliable determination of infestation by A. aegypti, and to find the best location for the installation of ovitraps in homes for surveillance actions and control.

Material and Methods

Study area

The study was conducted in the urban area of the municipality of Cambé, Paraná, Brazil, in homes located in the neighborhoods of Ana Rosa (divided into 2 areas: Ana Rosa 2 and Ana Rosa 3), Cambé 4, and Jardim Santa Isabel. The municipality of Cambé-PR, located at (51°15′37.44″ at 51°15′11.52″W and 23°16′0.48″ at 23°16′26.4″S), with an average altitude of 650 meters, has a humid mesothermic subtropical climate, with warm and rainy summers (mean maximal temperature of 22°C), mild winters (mean minimal temperature below 18°C), and without defined dry season.28 The area was chosen due to the relevant presence of A. aegypti with the latest LIRAa surveys.

Sampling for the Rapid Index Survey for Aedes aegypti—(LIRAa) and ovitraps

For comparison of the indices, we monitored 4 surveys conducted by health agents of the Municipal Secretariat of Health of the Municipal Prefecture of Cambé, in the above described neighborhoods, in the following periods: November 28 to December 2, 2011; January 9 to January 13, 2012; February 2 to February 11, 2012; and March 26 to March 30, 2012.

The LIRAa is Rapid Index Survey for Aedes aegypti—LIRAa—for Entomological Surveillance of A. aegypti in Brazil.

The LIRAa presents larval indices through the property infestation and Breteau indices and includes the types of containers (breeding sites). The percentage of positive houses given by the property infestation index (PII) is the result of the formula: PII = Positive Properties × 100/Properties Searched.29

The Breteau Index (BI) considers the positive recipients and properties surveyed without considering the productivity of breeding types. It is expressed by the following formula: BI = Positive Containers × 100/Properties Searched.29

The Container Type Index (ITR) is expressed by the formula: ITR = Positive Containers “X” × 100/Total Positive Containers. In this case “X” is the container type.29

In all the places, the A. aegypti infestation index rapid survey (LIRAa), which uses larval survey, and the use of ovitraps were carried out simultaneously for comparison of positive ovitrap index (POI) with the LIRAa.

In the surveys for the LIRAa, all containers with standing water were inspected in the intradomicile and peridomicile areas, where 1 in every 5 homes was investigated, using a larval net with 200 µm mesh with the help of a light source (flashlight). The captured larvae and pupae were transferred to flasks containing breeding water, and in the laboratory, the larvae, when necessary, were bred up to the third instar and then identified. Adults were obtained from the pupae for identification using the key contained in Walter Reed Biosystematics Unit (WRBU).30

Along with the LIRAa method, traps for oviposition were setup. The ovitraps31 consisted of black plastic pots with a capacity of 500 mL. A hardboard pallet, 15 × 3 cm (duratree) was placed inside the receptacle and 300 mL of hay infusion (30%) were added.

The hay infusion was prepared by the addition of 10 g of Megathyrsus maximus (Jacq.) B.K. Simon & S.W.L. Jacobs (Guinea grass) to 10 L of water, which was kept in a plastic drum covered with a screen and allowed to ferment for 7 days. The hay infusion to be used in the trap was filtered through a 200-µm mesh and diluted with tap water to obtain a 30% solution.

Of the homes sampled in the larval surveys, 60 were selected for installation of the ovitraps, where 1 was placed in the intradomicile and the other in the peridomicile area, totaling 120 traps in every survey. A week after installation, the traps were recovered, with their pallets duly labeled.

Preference of oviposition (intradomicile or peridomicile)

Ovitraps were installed in the neighborhoods Cambé 4, Ana Rosa 3, and Ana Rosa 2 in the period of November 2011 to February 2012. In each locality, 5 homes were examined, 1 per block, where 2 ovitraps were installed, 1 inside and the other outside each home, totaling 15 sampling points and 30 traps installed (Figure 1). The ovitraps were left in place for 12 weeks, with weekly change of liquid in the trap and substitution of pallets.

Figure 1.

Sampling design for comparison between LIRAa and ovitraps and preference of oviposition by Aedes aegypti depending on the installation place, the number of ovitraps per residence, and the number of pallets per ovitrap.


Preference of oviposition (number of pallets per ovitrap)

Nine homes were selected in each neighborhood, totaling 27 homes, distributed 1 per block, in the period of January 2012 to March 2012. The ovitraps were installed containing 1, 2, and 3 pallets, with 1 trap per home and varying the number of pallets (Figure 1). The maintenance of the traps and collection procedures were carried out as described above.

Preference of oviposition (number of ovitraps)

Ten homes were selected in 3 localities (Cambé 4, Ana Rosa 3, and Ana Rosa 2), totaling 30, with 1 home on every block in these 3 localities. The survey was performed in the period of November 2011 to February 2012. Around 1 to 5 ovitraps were installed in these homes (Figure 1). The collection procedures and identification were done as described in section “Preference of oviposition (intradomicile or peridomicile).”

For all experiments using ovitraps, the eggs on each pallet were counted with a stereomicroscope (Opton, 10 to 40X) and later hatching took place in plastic trays, incubated at 25°C ± 2°C until reaching the fourth instar for specifies identification.

Analysis of data

The rapid index surveys of A. aegypti by means of larval survey were analyzed using the BI and property infestation index (PII), as recommended by the Ministry of Health of Brazil.32 The first represents the number of infested containers with larvae for every 100 residences and the latter the proportion of houses infested with immature forms of A. aegypti. The oviposition in the ovitraps were analyzed via the POI, which indicates the percentage of traps that contained eggs, and by the egg density index (EDI), that shows how many eggs, on average, were found per trap.33 A simulated BI and PII were also calculated using the positive ovitraps as infested containers.

Comparative evaluation of the efficiency of larval survey and ovitraps in the surveillance of A. Aegypti density were carried out using the paired t-test in R v.3.6.0,34 between the BI and the simulated BI, as well as between the PII obtained from the 2 methods.

The indices used to analyze the oviposition in the ovitraps, POI and EDI, were used to evaluate the preference of oviposition by A. aegypti depending on the installation place, the number of ovitraps per residence, and the number of pallets per ovitrap, to evaluate the best configuration of ovitraps for surveillance of A. aegypti in areas of interest. The difference between the indices were evaluated in R v.3.6.0,34 using paired t-test for the installation place and 1-way repeated measures analysis of variance (ANOVA) or Friedman rank sum test for number of ovitraps and number of pallets.


A total of 5712 eggs were collected in the ovitraps installed during the 4 LIRAa surveys of A. aegypti conducted by agents of the Municipal Secretariat of Health (Table 1). The highest number of homes with traps positive for A. aegypti occurred in the third survey carried out in February 2012. Of the 60 homes inspected in the month of February, 52 (86.7%) showed mosquito eggs, and it was also when the highest number of eggs was recorded, 3526 (61.7%). Of these 4 collections, totaling 240 homes with ovitraps, 130 (54.2%) were positive with respect to presence of A. aegypti eggs, where 174 (36.3%) of the 480 traps checked during the study showed mosquito eggs.

Table 1.

Larval survey and use of ovitraps installed in homes where LIRAa were carried out by the Secretary of Health of Cambé, Paraná, Brazil, from November 2011 to April 2012, in an urban area of Cambé, Paraná, Brazil.


Significant differences occurred during the 4 surveys (P = .045) between the BI using the larval survey and the ovitraps using the paired t-test (Figure 2). In the 4 repetitions, the BI was greater with the ovitraps when compared with the larval survey. The highest BI with the ovitraps was seen in the month of February (120), whereas this index using the larval survey was 3.33. In the January survey, the BI was 61.67 while no larva was found in the homes by the survey larval method (Table 1).

Figure 2.

Comparison between the efficiency of ovitraps and larval survey in the Breteau index (BI) and the property infestation index (PII), from November 2011 to April 2012, in an urban area of Cambé, Paraná, Brazil.


In all surveys, a higher number of homes with positive ovitraps was found when compared with the PII (Figure 2) according to the paired t-test (P = .036). The larval survey showed that 1.3% of the residences were positive for immature forms of A. aegypti, whereas 54.2% were positive by ovitraps (Table 1). Furthermore, in January, 53.3% of homes sampled with ovitraps showed the presence of A. aegypti, while the PII was zero.

In the experiment with traps installed in the intra- and peridomicile areas, followed for 12 weeks, POI and EDI were higher in the peridomicile, but without statistical difference (P = .074 and P = .866, respectively) using the paired t-test, although the number of eggs were more stable at the peridomicile (Table 2).

Table 2.

Preference of oviposition of Aedes aegypti according to ovitrap location, number of pallets per ovitrap and number of ovitraps per residence, as measured by positive ovitrap index (POI) and egg density index (EDI).


Knowing that A. aegypti females jump around in carrying out oviposition, ovitraps were installed with different number of pallets. It was observed that the POI and EDI were highest in traps with 1 pallet in the neighborhoods Cambé 4 and Ana Rosa 2, but not in Ana Rosa 3, where traps with 2 pallets were higher. However, the differences were not significant according to the Friedman rank sum test (P = .717 and P = .717, respectively) (Table 2).

Also, it was necessary to determine the quantity of traps that would be ideal, in each home, for the evaluation of the population of A. aegypti in that area. The POI was highest in homes that contained 2 traps, but the differences did not show statistical significance (P = .291) according to the Friedman rank sum test and the EDI was highest in homes with 4 traps, although this difference was not statistically significant (P = .156) according to the 1-way repeated measures ANOVA (Table 2).


The sensitivity of ovitrap traps for the detection of the presence of A. aegypti was greater than that of the larval survey method. This finding reinforces the results previously obtained and reported in the literature. In many homes, the ovitrap traps showed positivity with respect to the presence of A. aegypti, while with the larval survey, it was not possible to detect the vector. But in 1988, Gomes affirmed that the infestation indices (property and Breteau) are weak indicators of the quantity of mosquitoes, and thus, limited for evaluating risks of disease transmission. Cardoso et al,35 in studies with ovitraps and BI in Catanduva-SP, after a dengue epidemic, observed that in the ovitraps the detection of A. aegypti occurred 2 months after control measures employed by the Ministry of Health, while by means of BI, they were detected after 4 months. The comparative studies of efficiency between the BI, PII, and ovitrap positivity index revealed the POI as the most efficient and sensitive detection method for A. aegypti in relation to larval indices.13,20,23,36

Ribeiro,37 besides proving the sensitivity of ovitraps for detecting the presence of the vector in places where larval survey was unable to detect it, demonstrated the importance of their use in indicating geographically the range of infestation in the country. According to Glasser and Gomes,38 the levels of larval infestation cannot, in particular circumstances, show a correlation with the incidence of dengue, where transmission has been recorded in periods with low BIs. Thus, the data obtained in this study corroborated these findings.

Besides the greater sensitivity for detecting the presence of mosquitoes in the observation area, the oviposition traps provided more information on the mosquito population. The use of ovitraps as sentinels in endemic areas increases the sensitivity of techniques for detecting the presence of the vector and can allow the implementation of preventive measures. Gama et al39 found greater sensitivity of ovitraps the larval survey, observing that PII and BI showed stable values during the whole experiment and that the POI varied 16.7% to 76.9%. Resende40 observed a greater sensitivity for entomological indices provided by ovitraps and MosquiTRAP than for larval survey, further showing that when the larval indices decline, the indices obtained in ovitraps and MosquiTRAP increase. Rueda41 found that the use of ovitrap indices is more advantageous than the Breteau and property indices, because it allows the mapping of the population density of A. aegypti in a locality. The ovitrap performs the early detection of vectors, besides the chemical control evaluation of adults, when the larval density indices do not detect, with rapidity and intensity, the density of the vector population.42 Therefore, the detection of eggs in the oviposition traps confirms the presence of gravid females in full hematophagous and consequently reproductive activity. Thus, in using ovitraps, it is important to characterize the early epidemiological situation to implement measures to prevent the expansion of dengue in a locality.

According to De Azevedo Marques et al,43 the larval infestation indices used are not sensitive for determining the levels of disease transmission. The immature forms’ detection in the larval survey cannot be a reflection of simultaneous presence of adult females in a locality, where these eggs can be accumulated in dry periods and hatch in response to favorable environmental conditions. The survey made by means of ovitraps estimates the population in current reproductive activity, allowing the monitoring and continuous evaluation of the population of A. aegypti.44

Aedes aegypti colonized the intradomicile and peridomicile areas, not demonstrating any preference for either of these environments in oviposition. Dhang et al,45 using ovitraps in residential areas in Kuala Lumpur, Malaysia, observed that there was no significant difference for A. aegypti between interior and exterior. According to Gomes et al,46 A. aegypti are found more often in intradomicile than peridomicile environments. Wan Norafikah et al,47 in studies with ovitraps in areas located in Malaysia, found that ovitrap positivity was greater in the peridomicile than intradomicile area. Wu et al,48 in studies with ovitraps in Southern Taiwan, found that more eggs of A. aegypti were collected inside than outside homes.

To determine the oviposition by A. aegypti females with respect to availability of substrate, it was observed that the use of only 1 pallet per ovitrap was sufficient for detecting the presence of A. aegypti and possibly estimating the population of females. In opposition to the results obtained, Acioli44 demonstrated that ovitraps with 3 pallets provided greater physical capacity for receiving higher numbers of eggs. This author also found that the maximum number of eggs in an ovitrap was 8925 eggs.

Also, differences were observed in the colonization of traps with 1 or more pallets, in the different locations studied, which can be related to the different levels of infestation of mosquitoes in these areas and not necessarily to the availability of greater number of pallets in the traps. Thus, the use of ovitraps with only 1 pallet is an adequate method for detecting the presence of A. aegypti in different areas, as previously demonstrated by Vezzani et al49 and Ríos-Velásquez et al.50

Traps with 1 pallet were more indicated because there was no significant difference between traps with different number of pallets. The increase in substrate for oviposition did not increase the efficiency of the oviposition trap for detecting the presence of the vector species.

On analyzing the POI obtained in homes with different number of traps, it was seen that 2 traps per home would be sufficient in monitoring projects in the urban area, even knowing the behavior of females of A. aegypti of using various places for oviposition in the same home.51,52

Besides the focus aimed at determining the presence of mosquitoes and offering a view of their population density in a particular area, the use of ovitraps can help in the control of the vector, by eliminating the eggs, more efficiently than only eliminating the breeding sites, as observed by Cheng et al.53

In a study carried out in areas with a high infestation of A. aegypti, where they found that the BI decreased significantly in areas with the presence of ovitraps. According to Marten,54 the use of ovitraps is an effective method for reducing the population of A. aegypti, where the ovitraps compete with breeding sites.

The results obtained in this study indicate that the indices calculated using the data obtained from the ovitraps showed greater sensitivity for detecting the presence and abundance of A. aegypti, and that 2 traps are sufficient at each surveillance point for use in conventional monitoring practices.

The use of only 1 pallet per trap can be indicated for surveillance works, because there was no significant difference between the traps with different number of pallets. The installation of traps only in the peridomicile area is sufficient for monitoring studies, thereby preventing difficulties in their installation and monitoring and making the process easier, requiring fewer hours for examining the ovitraps.


Dr. A. Leyva helped with English editing of the manuscript.

Author Contributions

KLCN was a master student, collected the data and developed the dissertation with the guidance of JL and JACZ who also assisted in data collection and interpretation of results. JFMdS assisted in the work statistics and interpretation of the results. All authors contributed to the writing of the final article and its review.



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© The Author(s) 2020 This article is distributed under the terms of the Creative Commons Attribution 4.0 License ( which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (
Kauani Larissa Campana Nascimento, João Fernando Marques da Silva, João Antonio Cyrino Zequi, and José Lopes "Comparison Between Larval Survey Index and Positive Ovitrap Index in the Evaluation of Populations of Aedes (Stegomyia) aegypti (Linnaeus, 1762) North of Paraná, Brazil," Environmental Health Insights 14(1), (29 January 2020).
Received: 9 October 2019; Accepted: 10 October 2019; Published: 29 January 2020

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