The Centers for Disease Control and Prevention (CDC) is a national public health agency in the United States.

The European Medicines Agency (EMA) is an agency of the European Union (EU) in charge of the evaluation and supervision of pharmaceutical products.

Immunodeficiency, also known as immunocompromised or immunosuppression, refers to a condition in which the immune system's ability to fight off infections and diseases is weakened or impaired.

An inactivated vaccine (or killed vaccine) is a vaccine consisting of virus particles, bacteria, or other pathogens that have been grown in culture and then killed to destroy disease-producing capacity.

Louis Pasteur (1822-1895) was a French chemist and microbiologist renowned for his groundbreaking discoveries in the field of infection control and vaccination.

Sodium bicarbonate, commonly known as baking soda, is a chemical compound with the formula NaHCO3.

Vaccination is the process of administering vaccines to individuals in order to protect them from certain diseases.

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.