Direct contact is not considered a primary mode of disease transmission as it involves physical contact between an infected individual and a susceptible host, rather than through an intermediate medium like air, water, or a vector.

Zoonotic diseases are those that can be transmitted from animals to humans, either directly or indirectly through an intermediate host.

Rabies is a zoonotic disease caused by the rabies virus, which is primarily transmitted through the bite of an infected animal, such as a dog or a bat.

The common cold is primarily transmitted through the air when an infected person coughs or sneezes, releasing droplets containing the virus into the air.

Malaria is transmitted through the bite of an infected female Anopheles mosquito.

HIV/AIDS is primarily transmitted through sexual contact with an infected person.

While avoiding contact with wild animals can reduce the risk of certain zoonotic diseases, it is not a general preventive measure for all zoonotic diseases.

Mad cow disease, also known as bovine spongiform encephalopathy (BSE), is caused by a prion, a type of infectious protein that can cause degeneration of the brain and spinal cord.

Measles is a highly contagious viral disease that is primarily transmitted through the air when an infected person coughs or sneezes.

Malaria is a vector-borne disease transmitted through the bite of an infected female Anopheles mosquito.

Boiling water is the most effective way to kill harmful bacteria and viruses that may be present in water, reducing the risk of waterborne diseases.

Influenza is not a zoonotic disease as it is primarily transmitted from person to person through respiratory droplets.

Tuberculosis is primarily transmitted through the air when an infected person coughs or sneezes, releasing droplets containing the bacteria into the air.

Salmonella is a type of bacteria that can cause foodborne illness when contaminated food is consumed.

Condom use is the most effective way to prevent the spread of STDs during sexual activity.