I constantly hear about people being allergic to bee stings but I rarely hear about people that are allergic to mosquito bites. Is it possible to be allergic to mosquito bites and if so, how common is that allergy? Are the reactions usually serious or mild? I constantly hear about yellow fever, west nile and malaria but I've never heard of people having allergic reactions after being bitten. How come some adults are completely desensitized to bites while other adults receive large red rashes?