Here are two human diseases caused by RNA viruses and how they are transmitted:

1. Influenza (Flu)

* Virus type: RNA virus (specifically an Orthomyxovirus)

* Transmission: Influenza is spread through respiratory droplets produced when an infected person coughs, sneezes, or talks. These droplets can be inhaled by others or land on their eyes, nose, or mouth.

2. HIV (Human Immunodeficiency Virus)

* Virus type: RNA virus (specifically a Retrovirus)

* Transmission: HIV is transmitted through bodily fluids such as blood, semen, vaginal fluids, and breast milk. This can occur through:

* Unprotected sexual contact

* Sharing needles or syringes

* From mother to child during pregnancy, childbirth, or breastfeeding

* Accidental needle sticks or other exposure to contaminated blood.