Which disease category is among the four most commonly occurring in contingency operations?

• A. Tickborne
• B. Vectorborne
• C. Foodborne
• D. Sexually transmitted.

Answer: (B)

In contingency operations, the most common disease threats come from infections transmitted by vectors such as mosquitoes and ticks. Disasters and crowded aid camps often create environmental conditions—standing water, warmth, disrupted infrastructure, and close living quarters—that boost vector breeding and bring more people into contact with vectors. This combination leads to rapid and widespread vectorborne transmission, so responses prioritize surveillance, vector control, and prevention across different pathogens. The broad category of vectorborne infections captures a wide range of diseases, not just a single organism, which is why it tends to be a dominant focus in emergency settings. While tickborne illnesses are a part of this category, the broader vectorborne label is more representative of the common risks encountered. Foodborne outbreaks and sexually transmitted infections do occur, but they don’t consistently rise to the same level of frequency or immediacy across diverse contingency operations as vectorborne diseases.