1. Aged >=18 years when enrolled, 2. Participants signing the informed consent, 3. Being able to participate in all planned follow-ups and accomplish all research procedures including completing a diary card and coming back for interview, 4. Having not been administered any pneumonia vaccine or COVID-19 vaccine, and having not been administered an influenza vaccine in the current season before enrollment, 5. >=14 days from the most recent vaccination, 6. Before enrollment, the body temperature < 37.3 degree C as confirmed by medical history and clinical examination.

1. Aged >=18 years when enrolled, 2. Participants signing the informed consent, 3. Being able to participate in all planned follow-ups and accomplish all research procedures including completing a diary card and coming back for interview, 4. Having not been administered any pneumonia vaccine or COVID-19 vaccine, and having not been administered an influenza vaccine in the current season before enrollment, 5. >=14 days from the most recent vaccination, 6. Before enrollment, the body temperature < 37.3 degree C as confirmed by medical history and clinical examination.

1. Aged >=18 years old when enrolled, 2. Participants signing the informed consent, 3. Being able to participate in all planned follow-ups and accomplish all research procedures including completing a diary card and coming back for interview, 4. Having not been administered any pneumonia vaccine or COVID-19 vaccine, and having not been administered an influenza vaccine in the current season before enrollment, 5. >=14 days from the most recent vaccination, 6. Before enrollment, the body temperature <37.3 degree C as confirmed by medical history and clinical examination.

1. Aged >=18 years old when enrolled, 2. Participants signing the informed consent, 3. Being able to participate in all planned follow-ups and accomplish all research procedures including completing a diary card and coming back for interview, 4. Having not been administered any pneumonia vaccine or COVID-19 vaccine, and having not been administered an influenza vaccine in the current season before enrollment, 5. >=14 days from the most recent vaccination, 6. Before enrollment, the body temperature <37.3 degree C as confirmed by medical history and clinical examination.