Answer:
Sexual Contact: HIV
Human immune deficiency virus is transmitted from the infected person to the non infected person by some of the body fluids such as vaginal fluids, rectal fluids.
It is spread by having sex, sharing the injection of drug equipment, with the person having HIV.
Direct Contact: Flu
The disease such as flu is spread by coming in contact with the infected person.The person who is sneezing or coughing with the person who is not having cold get infected by the contamination around him.
Animal Vector: Malaria
The mosquitoes acts as the vector which transmits malarial parasites in the body. It is transmitted by a vector which is a mosquitoes.