Actually Hammas is spread by contact. If you touched someone who lived next door to someone who’s family dog was given to them by someone who had a family member join Hamas, then you become Hamas too.
The only way to innoculate yourself against this pathogen is by loudly and vigorously condemning Hamas for at least two minutes a day.
It should however be noted that condemning Hamas, and having absolutely no affiliation with any of their members provides no protection against Israeli forces mistaking you for a Hamas fighter and subsequently shooting/bombing/starving you to death.