Which of the following is a supplemental immunization activity under the Ligtas Tigdas program?

The Ligtas Tigdas program specifically aims to eliminate measles and to enhance the immunization efforts across the population. A supplemental immunization activity is defined as an initiative that is not part of the routine immunization schedule but is organized to boost immunity in a target population. The term "Ligtas Tigdas Supplemental Immunization Activity" directly aligns with this definition, as it refers explicitly to the organized efforts designed to increase measles vaccination coverage in areas where rates might be low, supplementing the primary immunization schedule.

While the National Measles Campaign, Knockout Tigdas, and the Polio Booster Program are all significant initiatives in public health, they target different aspects of disease prevention or other diseases. The National Measles Campaign might encompass various activities, but it is not specifically identified as a supplemental activity tailored under the Ligtas Tigdas program's framework. Similarly, the Knockout Tigdas is a program aimed at eliminating measles, and the Polio Booster Program focuses on polio, not measles. Thus, they do not fit the description of being a supplemental immunization activity under the specific parameters of the Ligtas Tigdas program.