What are the two ways disease can be transmitted?

What are the two ways disease can be transmitted?

• A. Direct and Indirect
• B. Airborne and Contact
• C. Vertical and Horizontal
• D. Zoonotic and Vector-borne

Answer: (A)

Disease transmission occurs through two broad pathways: direct and indirect. Direct transmission involves the immediate transfer of pathogens from an infectious source to a susceptible person through close contact or droplets, such as touching, kissing, sexual contact, or droplets from coughing or sneezing that reach someone nearby. Indirect transmission happens when a middle vehicle or medium carries the pathogen to a new host—through contaminated surfaces (fomites), contaminated food or water, inhalation of airborne particles, or a bite from an infected vector. These two mechanisms cover most transmission scenarios, while the other choices describe specific routes or contexts that fit within these categories but do not describe the two general ways.

Disease transmission occurs through two broad pathways: direct and indirect. Direct transmission involves the immediate transfer of pathogens from an infectious source to a susceptible person through close contact or droplets, such as touching, kissing, sexual contact, or droplets from coughing or sneezing that reach someone nearby. Indirect transmission happens when a middle vehicle or medium carries the pathogen to a new host—through contaminated surfaces (fomites), contaminated food or water, inhalation of airborne particles, or a bite from an infected vector. These two mechanisms cover most transmission scenarios, while the other choices describe specific routes or contexts that fit within these categories but do not describe the two general ways.