Indirect transmission includes which of the following routes?

• A. Airborne transmission, contaminated surfaces, food or drink, animal waste, insects, and environmental
• B. Direct contact only
• C. Bloodborne exposure
• D. Sexual transmission

Answer: (A)

Indirect transmission happens when a pathogen moves from an infected source to a susceptible person through an intermediary medium rather than by direct person-to-person contact. Airborne spread, transfer via contaminated surfaces (fomites), ingestion of contaminated food or drink, exposure through animal waste, transmission by insects, and contact with contaminated environmental sources all fit this pathway because the pathogen travels through an intermediary medium before reaching a new host. In contrast, direct contact requires physical interaction with an infected person, bloodborne exposure involves blood contact (often via needles or open wounds), and sexual transmission occurs through direct contact during sexual activity. Thus, the described routes exemplify indirect transmission.