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EV-D68 VIRUS: The EV-D68 VIRUS is re-emerging. This virus can be spread from one infected person to another infected person through coughing, sneezing, or by touching contaminated surfaces.

Source: http://www.cdc.gov/non-polio-enterovirus/about/ev-d68.html

ZIKA Virus: Zika virus is spread to humans mainly through the bit of an infected mosquito. They are the same species of mosquitoes that spread Chikungunya and Dengue. This specific virus can be spread from a pregnant mother to her baby during pregnancy. About 1 in 5 people will get sick; however, the illness is usually mild. There is currently no cure.

Source: http://www.cdc.gov/zika/disease-qa.html

West Nile Virus: West Nile virus is an anthropod-borne virus (arbovirus) that is typically spread by mosquitoes. Mosquitoes become diseased when they nurse on infected birds. These diseased mosquitoes can not only spread the virus to humans, but they can spread it to animals as well. West Nile virus can and has caused death.

Source: http://www.cdc.gov/westnile/faq/genquestions.html

Chikungunya: Chikungunya is a transmitted to humans through mosquito bites. Mosquitoes become diseased when they nurse on another human that is already infected with the virus. The typical symptoms for this is a sudden onset of fever that last two to four days, with joint pains that can last weeks, months or sometimes years.

Source: http://www.cdc.gov/chikungunya/index.html

Dengue: Dengue virus is one of the leading causes of dengue fever. Dengue fever is known to cause severe illness and death in the tropics and subtropics. Early recognition can lower the threat of medical complications and death.

Source: http://www.cdc.gov/dengue/

Yellow Fever: Yellow fever virus is spread to humans by the bit of an infected mosquito. It is typically found in tropical and subtropical areas. Initial symptoms include onset of fever, chills, headaches, fatigue, and many other initial symptoms. Yellow fever can be prevented by vaccination.

Source: http://www.cdc.gov/yellowfever/qa/index.html

Additional Information: Mosquitoes spread heart worms to dogs and also spreads several strains of encephalitis.