Final answer:
Picornaviridae, a group of viruses, is primarily transmitted through the fecal-oral route in contaminated water or food. Other transmission methods include airborne transmission through inhalation of droplets or aerosols and vertical transmission from mother to child during or soon after birth.
Step-by-step explanation:
The Picornaviridae family of viruses can be transmitted via several routes, one of which is the fecal-oral route. This is particularly common in developing countries, often involving contamination through water or undercooked meat. The transmission occurs when pathogens in feces from an infected host are ingested by a new host through contaminated food, water, or by contact with contaminated surfaces, which can then result in a new infection.
Aside from the fecal-oral route, members of the Picornaviridae family can also be transmitted through other routes including airborne transmission, via droplets or aerosols expelled during coughing or sneezing by an infected person. Contagious viral particles can be inhaled by nearby individuals, leading to new infections. Viruses within this family are also known to be transmitted through vertical transmission from mother to fetus, or to an infant during or soon after birth.