If you were about to enter a crowded subway during flu season, packed with people sneezing and coughing, wouldn't it be helpful if your immune system recognized the potentially risky situation and bolstered its defenses upon stepping into the train?
According to a new study by University of Pennsylvania and Imperial College London researchers, the mosquito immune system does something similar. After ingesting a meal of blood, mosquitoes ramp up production of immune system proteins that help fight off the parasites that blood might contain.