The deltoid muscle in the arm: This is considered the most commonly used site for vaccinations, and it is relatively small for injections, with a maximum volume of 1 milliliter.
The anterior thigh muscle: This muscle is preferred for self-injection due to ease of control and location identification.
The vastus lateralis muscle of the hip: This site is the safest for adults and older children over 7 months, as it is deep and not close to major blood vessels and nerves.
The dorsal muscle and gluteal muscles: This site has been the most common and widely used by healthcare providers for many years.