What Are the Causes of Liver Spots? The appearance of liver spots is quite common in men and women over the age of 40. Liver spots develop over time, usually taking years to appear, and, although they have the word liver in their name, these dark patches on the skin have nothing to do with the human liver or liver disease.
Mosquito vectored diseases include protozoan diseases, i.e., malaria, filarial diseases such as dog heartworm, and viruses such as dengue, encephalitis and yellow fever.
A. Dengue is transmitted to people by the bite of an Aedes mosquito that is infected with a dengue virus. The mosquito becomes infected with dengue virus when it bites a person who has dengue virus in their blood. The person can either have symptoms of dengue fever or DHF, or they may have no symptoms.After about one week, the mosquito can then transmit the virus while biting a healthy person.he mosquito becomes infected with dengue virus when it bites a person who has dengue virus in their blood. The person can either have symptoms of dengue fever or DHF, or they may have no symptoms. After about one week, the mosquito can then transmit the virus while biting a healthy person.