scholarly journals Bancroftian filariasis in Pondicherry, South India: 1. Pre-control epidemiological observations

1989 ◽  
Vol 103 (3) ◽  
pp. 685-692 ◽  
Author(s):  
P. K. Rajagopalan ◽  
P. K. Das ◽  
S. Subramanian ◽  
P. Vanamail ◽  
K. D. Ramaiah
Keyword(s):  
Control Strategy ◽  
South India ◽  
Older Age ◽  
Integrated Vector Management ◽  
Bancroftian Filariasis ◽  
Age Classes ◽  
National Programme ◽  
Epidemiological Features ◽  
Vector Management ◽  
Age Dependent

SUMMARYA 5-year Integrated Vector Management (IVM) project was implemented in Pondicherry, South India, for the control of Bancroftian filariasis. The efficacy of the IVM strategy was compared with routine control strategy under the national programme. The present paper describes the pre-control epidemiological features of filariasis as determined by a mass blood survey in 1981. Of 24946 persons examined 8·41%; were microfilaraemic. Microfilaraemia prevalence was homogeneous throughout the study area. The prevalence and intensity of microfilaraemia were age dependent, and increased monotonically until about 20 years, following which there was a decline until about 40 years to become relatively stable in older age classes. The gender profiles of both prevalence and intensity of microfilaraemia showed no difference between the sexes until about 15 years of age, following which both were higher in males compared to females. The distribution of microfilarial counts was overdispersed, indicating aggregation of adult worms.

scholarly journals Bancroftian filariasis in Pondicherry, South India: 2. Epidemiological evaluation of the effect of vector control

1989 ◽  
Vol 103 (3) ◽  
pp. 693-702 ◽  
Author(s):  
S. Subramanian ◽  
S. P. Pani ◽  
P. K. Das ◽  
P. K. Rajagopalan
Keyword(s):  
Vector Control ◽  
Control Programme ◽  
Population Characteristics ◽  
Bancroftian Filariasis ◽  
National Programme ◽  
Vector Management ◽  
Apparent Reduction ◽  
Epidemiological Evaluation ◽  
Relative Change ◽  
The Town

SUMMARYThis article examines the evaluation of a bancroftian filariasis control programme undertaken in Pondicherry from 1981–5. Integrated vector management was applied in one half of the town, and routine operations under the national programme (larviciding and chemotherapy) continued in the comparison area. The programme was evaluated by monitoring relative change in the epidemiological statistics of both populations. The results indicate that there was significant reduction in prevalence of microfilaraemia in juveniles in the controlled area. An apparent reduction in intensity of microfilaraemia was also observed but this was a consequence of the reduction in prevalence, since the density of microfilariae remained unchanged. The results suggest that primary constraints on the epidemiological evaluation of the vector control of filariasis are the longevity and the population characteristics of the parasite.

scholarly journals Bancroftian filariasis in Pondicherry, South India – epidemiological impact of recovery of the vector population

1992 ◽  
Vol 108 (3) ◽  
pp. 483-493 ◽  
Author(s):  
P. K. Das ◽  
A. Manoharan ◽  
S. Subramanian ◽  
K. D. Ramaiah ◽  
S. P. Pani ◽  
...  
Keyword(s):  
South India ◽  
Specific Rate ◽  
Bancroftian Filariasis ◽  
Comparison Area ◽  
Vector Population ◽  
General Decline ◽  
Transmission Index ◽  
Vector Management ◽  
Epidemiological Impact ◽  
The Town

SUMMARYAn Integrated Vector Management (IVM) strategy was implemented from 1981 to 1985 in one part of Pondicherry, South India, for the control of the bancroftian filariasis vector Culex quinquefasciatus (the IVM area). The rest of the town (the comparison area) received the conventional larvicidal input. After 1985 both the areas were managed conventionally. The switch to conventional strategy resulted in an increase of vector density in both areas. The microfilaraemia prevalence in humans showed a general decline (P < 0·05) from 1986 to 1989 only in the IVM area whereas its intensity did not change significantly in either area. While the age-specific rate of gain of infection was generally unchanged in the IVM area, an increase in all age classes was observed after 1985 in the comparison area, where the Annual Transmission Index was high during the previous years. In both areas the rate of loss of infection increased during 1986–9 compared to 1981–6. The results suggest that 3 years is too short a period to relate the changes in entomological parameters to those in the microfilaraemia status of the population.

scholarly journals Conspecific and allospecific larval extracts entice mosquitoes to lay eggs and may be used in attract-and-kill control strategy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gabriel B. Faierstein ◽  
WeiYu Lu ◽  
Andréa K. L. S. Sena ◽  
Rosângela M. R. Barbosa ◽  
Walter S. Leal
Keyword(s):  
Control Strategy ◽  
Field Experiments ◽  
Deterrent Effect ◽  
Oviposition Stimulant ◽  
Dependent Manner ◽  
Integrated Vector Management ◽  
Vector Management ◽  
Attract And Kill ◽  
Gravid Mosquitoes ◽  
Dose Dependent

Abstract One of the strategies of integrated vector management is to lure gravid mosquitoes for surveillance purposes or to entice them to lay eggs in water containing toxins that kill the offspring (attract-and-kill or trap-and-kill). Typically, the major challenge of this approach is the development of a lure that stimulates oviposition plus a toxin with no deterrent effect. Bacillus thuringiensis var. israelensis (Bti) satisfies the latter criterion, but lures for these autocidal gravid traps are sorely needed. We observed that gravid Aedes aegypti, Ae. albopictus, and Culex quinquefasciatus laid significantly more eggs in cups with extracts from 4th-stage larvae (4 L) of the same or different species. No activity was found when 4 L were extracted with hexane, diethyl ether, methanol, or butanol, but activity was observed with dimethyl sulfoxide extracts. Larval extracts contained both oviposition stimulant(s)/attractant(s) and deterrent(s), which partitioned in the water and hexane phases, respectively. Lyophilized larval extracts were active after a month, but activity was reduced by keeping the sample at 4 °C. In the tested range of 0.1 to 1 larvae-equivalent per milliliter, oviposition activity increased in a dose-dependent manner. In field experiments, Ae. aegpti laid significantly more eggs in traps loaded with larval extracts plus Bti than in control traps with water plus Bti.

scholarly journals Zika: an ongoing threat to women and infants

2018 ◽  
Vol 34 (11) ◽  
Author(s):  
Beatriz Macedo Coimbra dos Santos ◽  
Flavio Codeço Coelho ◽  
Margaret Armstrong ◽  
Valeria Saraceni ◽  
Cristina Lemos
Keyword(s):  
Sexual Transmission ◽  
Risk Groups ◽  
Gender Disparity ◽  
Incidence Rates ◽  
Older Age ◽  
Age Classes ◽  
Sharp Drop ◽  
Men And Women ◽  
Women And Children ◽  
Previous Summer

Recent data from the municipality of Rio de Janeiro, Brazil, shows a sharp drop in the number of reported occurrences of Zika during the summer of 2016/2017, compared to the previous summer. There is still a much higher incidence among women than men, almost certainly due to sexual transmission. An unexpected feature of the new data is that there are proportionally far more cases affecting children under 15 months than older age classes. By comparing incidence rates in 2016/2017 and 2015/2016, we were able to deduce the proportion of reported cases affecting men and women, and verify that gender disparity is still present. Women and children are still risk groups for Zika infection, even during non-epidemic seasons.

scholarly journals Residual Pesticide On Hesco® Blast Protection Wall In Temperate Florida Habitat Effective Against Mosquitoes, Stable Flies, and Sand Flies

2018 ◽  
Vol 34 (3) ◽  
pp. 224-232 ◽  
Author(s):  
Seth C. Britch ◽  
Kenneth J. Linthicum ◽  
Robert L. Aldridge ◽  
Todd W. Walker ◽  
Mattie J. E. Rush ◽  
...  
Keyword(s):  
Department Of Defense ◽  
Sand Flies ◽  
Integrated Vector Management ◽  
United States Military ◽  
Stable Flies ◽  
Blast Protection ◽  
Us Military ◽  
Vector Management ◽  
The Us ◽  
Residual Pesticide

ABSTRACT United States military troops in the field are exposed to the environment and are thus at high risk for transmission of arboviruses, and degradation of mission from continual harassment from insects. Passive vector control, such as application of residual insecticides to US military materials common in the field such as tents and camouflage netting, has been shown to be effective and can contribute to a successful integrated vector management (IVM) plan in the field to reduce this risk. However, other common US military field materials have not been evaluated with residual pesticides. In this study we conducted the first known investigation of the efficacy and longevity of a residual pesticide containing λ-cyhalothrin applied to HESCO® blast protection wall geotextile. We exposed treated material to a temperate Florida environment and found that this treatment can be effective against sand flies, filth-breeding flies, and mosquitoes for at least 6 wk. This study provides evidence that residual treatment of this US military material may be leveraged as an IVM component to enhance the US Department of Defense pest management system.

scholarly journals A Field Efficacy Evaluation of In2Care Mosquito Traps in Comparison with Routine Integrated Vector Management at Reducing Aedes aegypti

2021 ◽  
Vol 37 (4) ◽  
pp. 242-249
Author(s):  
Eva A. Buckner ◽  
Katie F. Williams ◽  
Samantha Ramirez ◽  
Constance Darrisaw ◽  
Juliana M. Carrillo ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Large Scale ◽  
Pathogen Transmission ◽  
Small Scale ◽  
Integrated Vector Management ◽  
Control Programs ◽  
Vector Management ◽  
Scale Field ◽  
Large Scale Field ◽  
Eggs And Larvae

ABSTRACT Aedes aegypti is the predominant vector of dengue, chikungunya, and Zika viruses. This mosquito is difficult to control with conventional methods due to its container-inhabiting behavior and resistance to insecticides. Autodissemination of pyriproxyfen (PPF), a potent larvicide, has shown promise as an additional tool to control Aedes species in small-scale field trials. However, few large-scale field evaluations have been conducted. We undertook a 6-month-long large-scale field study to compare the effectiveness and operational feasibility of using In2Care Mosquito Traps (In2Care Traps, commercially available Aedes traps with PPF and Beauveria bassiana) compared to an integrated vector management (IVM) strategy consisting of source reduction, larviciding, and adulticiding for controlling Ae. aegypti eggs, larvae, and adults. We found that while the difference between treatments was only statistically significant for eggs and larvae (P &lt; 0.05 for eggs and larvae and P &gt; 0.05 for adults), the use of In2Care Traps alone resulted in 60%, 57%, and 57% fewer eggs, larvae, and adults, respectively, collected from that site compared to the IVM site. However, In2Care Trap deployment and maintenance were more time consuming and labor intensive than the IVM strategy. Thus, using In2Care Traps alone as a control method for large areas (e.g., &gt;20 ha) may be less practical for control programs with the capacity to conduct ground and aerial larviciding and adulticiding. Based on our study results, we conclude that In2Care Traps are effective at suppressing Ae. aegypti and have the most potential for use in areas without sophisticated control programs and within IVM programs to target hotspots with high population levels and/or risk of Aedes-borne pathogen transmission.

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