Unhygienic conditions coupled with fluctuations in temperature are major reasons for the unusual breeding of mosquitoes.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/andhra-pradesh-rise-mosquito-numbers-rings-alarm-bells
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-chronicle-hyderabad
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andhra-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vector-borne-diseases
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nizamabad-d
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/malaria
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health