There is some information on measuring mosquito density and also its impact on disease transmission. I know the experience with Aedes aegypti and dengue in Honduras. You can do research in breeding sites, collection of pupaes and number of females ovipositing and from there to do some calculations and extrapolation.

Please follow this link and I hope you find some relevant information for your question

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https://www.nescent.org/wg/selfishdna/images/e/e5/Focks_et_al._1995_DENSIM_a_detailed_model_of_dengue_epidemiology.pdf

There are few methods of measuring the mosquito density in an area.

1. Total knockout density in a room at a given time. It can be measured by  spraying the pyrethrum in a room and collecting the mosquito on a white bed sheet on the floor of the room. Different species may be identified by means of  binocular microscope and counted.

2. By means of UV light trap.

3. Hand collection: by means of suction tube. Per man hour mosquito room density etc.

Direct field sampling of the mosquitoes in your area of interest using appropriate trap and blend (if required) can help you assess mosquito density. For malaria you may want to compare clinical data from the adjacent health institutions factoring in the areas where the individuals who were positive for malaria test in the register reside and also conduct a sporozoite PCR test on sampled malaria vectors.

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Aftab,

I believe this is the $500,000 question.  If you review the websites that show positive mosquito pools and positive cases of disease, such as for West Nile Virus (WNV), it is difficult to use these as predictors.  Our lab review the CDC-USGS Disease Maps  (http://diseasemaps.usgs.gov/mapviewer/), specifically for Texas for the past several years. There were positive pools and no human cases in some counties, or positive human cases and no positive mosquito pools.  Whether this is due to problems with not getting all the data in to the central database plus the lack of diagnosis on mild WNV fever cases or the inability to trap based on financial constraints; maybe all of this and more. 

My personal feeling is that more education is needed all around, especially with the emerging infectious diseases moving into areas where the ecology of a known vector may not be the same as in other habitats and may not be fully understood, as yet.   

I' m JC Toto from Cameroon,you have many methods  to collect  mosquitoes, each  one can give an estimate of mosquitoes density

Thank

I enjoyed reading the 500,000 answer of Celinda. I find no positive answer about the density of any mosquito species. Using light traps, you will hardly find any Aedes species, particularly aegypti  and albopictus. Collecting mosquitoes  biting cattle for one hour after dusk will give you comparative density for  mosquito species  in that area. Using  concurrent collection of mosquitoes biting cattle and human baits,  will show you the behaviour and preference of mosquitoes. Larval collection using number of dips will give the species present in that breeding place - but that is also preferential as some species may not breed  in that water Pyrethroid knock-down in a close room  will tell you mosquito species in that room, but you may not find Ae. aegypti and Ae. albopictus,  which rest outside and bite during day  time. Through a corelational study scientists opined that if you find 3  mosquitoes as a result of one man-hour search, then you may announce that  An. culicifacies  density is good enough to transmit malaria.  I feel mosquitoes have an upper hand regarding their bionomics, which is still in infancy. Wish you GOOD LUCK.

I agree with Dr. Aslam Khan. There is no single method to deal with all species. 

It can be measured by spraying the pyrethrum in a room and collecting the mosquito on a white bed sheet on the floor of the room.

Here in our place, we use water + 5% boric acid. When wild female mosquito come to consume the liquid they leave there saliva the solution cause them crystalized as the white ring on the water edge. we can collect wight to monitor the population changes in even daily bases. (Google "mosquito control, killing off the females" for more info. Please)