What type of viruses might be included under horizontal transmission examples?

Horizontal transmission refers to the spread of infectious agents from one individual to another, typically within the same generation. This can occur through various means, such as direct contact, sexual intercourse, or through other routes that do not involve maternal transfer.

The correct answer is representative of horizontal transmission because HIV can be transmitted between individuals through sexual intercourse. This method involves direct person-to-person contact where the virus is exchanged through bodily fluids, which is a classic example of horizontal transmission in infectious diseases.

Considering the other scenarios, HIV through blood transfusion is an example of horizontal transmission as well, but it is often viewed within the context of medical procedures rather than direct person-to-person contact. COVID-19 transmission through airborne particles is indeed a form of horizontal transmission, as it spreads from person to person through respiratory droplets, but it is not the context here since the question seeks a less direct route where bodily fluids are exchanged. Finally, influenza transmitted from water sources is not a typical transmission route for influenza, which is mainly spread through respiratory droplets and direct contact.