There is an outbreak of measles in some areas of the community where Nurse Rona is assigned. Which of the following-steps of an outbreak investigation should Nurse Rona and her team begin ?

Correct Answer: A

Rationale: The correct answer is A: Identify and count cases. In the initial stages of an outbreak investigation, it is crucial to identify and count cases to understand the scope and magnitude of the outbreak. By counting cases, Nurse Rona and her team can track the spread of the disease, identify common characteristics among those affected, and determine the extent of the outbreak. This step helps in guiding further investigation and control measures. Summary of other choices: B: Define and identify cases - While defining cases is important, it is not the initial step in outbreak investigation. C: Verify diagnosis - Verifying diagnosis is important but comes after identifying and counting cases. D: Prepare for field work - Field work is important in outbreak investigations, but it typically comes after the initial step of identifying and counting cases.

Correct Answer: C

Rationale: The correct answer is C: Food and water. Typhoid fever is primarily transmitted through contaminated food and water by the bacterium Salmonella typhi. The bacteria are shed in the feces of infected individuals and can contaminate water sources or food prepared with contaminated water. This transmission route aligns with the typical epidemiology of typhoid fever outbreaks. Now, let's discuss why the other choices are incorrect: A: A vector - Typhoid fever is not transmitted by a vector such as mosquitoes or ticks. B: Blood and body fluids - Typhoid fever is not typically spread through blood or body fluids but rather through ingestion of contaminated food or water. D: Air - Typhoid fever is not an airborne disease and is not transmitted through the air.

Correct Answer: C

Rationale: The correct answer is C: Fifth month. Nurse Vera should explain that the fetal heart can typically be heard using a Doppler ultrasound device around the fifth month of pregnancy. This is because the baby's heart is developed enough to produce audible sounds by this time. Choices A, B, and D are incorrect because in the ninth month, the baby is ready for delivery, in the third month the heart is still developing, and in the first month the heart is just beginning to form and is not yet audible.

Correct Answer: B

Rationale: The correct answer is B: Equity in services. Collaboration and teamwork in public health are crucial to ensure equal access to services for all populations, regardless of their background or socioeconomic status. By working together, public health professionals can identify disparities and implement strategies to address them, ultimately leading to improved equity in healthcare services. A: Staff performance - While collaboration and teamwork can positively impact staff performance, the primary focus in public health is on achieving equity in services for all individuals. C: Proper use of resources - Collaboration can help optimize resource allocation, but the main goal in public health is to ensure equitable access to services. D: Quality healthcare - While collaboration can enhance the quality of healthcare, the primary emphasis in public health is on promoting equity in services to address health disparities.

Correct Answer: A

Rationale: The correct answer is A: Key informant interview. Ms. Nena will use this method to gather in-depth information from knowledgeable individuals within the community. This approach allows her to gain insights and perspectives from key stakeholders, such as the primary grade teacher and barangay official, who have first-hand knowledge and experience. Key informant interviews are particularly useful for obtaining specific details, opinions, and insights that may not be easily accessible through other methods. In contrast, participant observer involves direct participation in community activities, community mapping focuses on spatial data collection, and social survey typically involves collecting data from a larger sample size rather than individual key informants.