Which of the following is NOT a type of infection risk mentioned?

Influenza is primarily a viral infection affecting the respiratory system and is not typically associated with the types of infection risks related to On-Site Sewage Facilities (OSSF). The other options listed represent specific health risks that can be linked to exposure to contaminated water or soil, which are critical considerations in the management of on-site sewage systems.

Hepatitis A is a viral liver infection that can be contracted through contaminated water, highlighting the importance of sanitary disposal of human waste. Leptospirosis is a bacterial infection often associated with the handling of water contaminated with animal urine, also emphasizing the significance of proper sewage treatment. Parasites, including protozoa and helminths, can be transmitted via contaminated water or food, reinforcing the need for effective sewage management to prevent their spread.

Thus, influenza stands out as the option that does not directly relate to infection risks specifically mentioned in the context of on-site sewage facility management.