Several factors can influence infectivity, including:
1. Mode of Transmission: Pathogens spread through different routes such as respiratory droplets, direct contact, or vectors like mosquitoes. The ease of transmission can significantly impact infectivity. 2. Dose of Pathogen: The amount of pathogen required to establish an infection plays a role. A lower infectious dose means higher infectivity. 3. Host Susceptibility: The immune status, age, and genetic factors of the host population influence how easily they can be infected. 4. Environmental Factors: Temperature, humidity, and sanitation conditions can affect the survival and spread of pathogens.
