Which of the following is NOT a vector control method used in Public Health Operations?

• A. Vaccination
• B. Source reduction
• C. Larviciding
• D. Residual insecticide spraying

Answer: (A)

Vector control aims to reduce vector populations or their contact with people. Source reduction cuts breeding sites, lowering the number of vectors at the source. Larviciding targets the immature aquatic stages to prevent them from reaching adulthood. Residual insecticide spraying kills adult vectors on contact, reducing their ability to bite and transmit pathogens. Vaccination, by contrast, strengthens human immunity to the disease, lowering infection risk without changing vector numbers or behavior. Because it does not directly reduce or manage the vector population, vaccination is not considered a vector control method in Public Health Operations.