Adults over 65 years old are at highest risk for developing severe influenza complications, such as pneumonia, bronchitis, and hospitalization.

All adults over 65 years old should receive the influenza vaccine, pneumococcal vaccine, and tetanus-diphtheria-pertussis vaccine.

Streptococcus pneumoniae, Haemophilus influenzae type b, and respiratory syncytial virus are all common causes of pneumonia in children under 5 years old.

All children under 5 years old should receive the diphtheria-tetanus-pertussis vaccine, measles-mumps-rubella vaccine, and polio vaccine.

Streptococcus pneumoniae, Neisseria meningitidis, and Listeria monocytogenes are all common causes of meningitis in pregnant women.

All pregnant women should receive the influenza vaccine, tetanus-diphtheria-pertussis vaccine, and hepatitis B vaccine.

Streptococcus pneumoniae, Staphylococcus aureus, and Escherichia coli are all common causes of sepsis in people with chronic health conditions.

All people with chronic health conditions should receive the influenza vaccine, pneumococcal vaccine, and hepatitis B vaccine.

Mycobacterium tuberculosis, Mycobacterium avium complex, and Mycobacterium kansasii are all common causes of tuberculosis in people with HIV/AIDS.

All people with HIV/AIDS should receive the influenza vaccine, pneumococcal vaccine, and hepatitis B vaccine.

Plasmodium falciparum, Plasmodium vivax, and Plasmodium ovale are all common causes of malaria in pregnant women.

Rotavirus, Shigella, and Escherichia coli are all common causes of diarrheal disease in children in developing countries.

All children in developing countries should receive the measles vaccine, polio vaccine, and diphtheria-tetanus-pertussis vaccine.

Streptococcus pneumoniae, Haemophilus influenzae type b, and Pneumocystis jirovecii are all common causes of pneumonia in people with HIV/AIDS.

Streptococcus pneumoniae, Staphylococcus aureus, and Escherichia coli are all common causes of sepsis in children in developing countries.