lymphokines
Frontline claims to control fleas and ticks but if you have been using it too long, your fleas may be immune to it. Try Revolution. Based on studies, they protect better!
yes
yes
Respiratory and Immune Systems
Respiratory and Immune Systems
Your immune system or your live, but you have to have healthy liver to filter out all your diseases.
Depression lowers everyone's immunity. Everything is depressed, not just the mood.
The immune system
Yes. The unsanitary conditions of the cities drew rats to populated areas. The rats were carrying fleas infected with the disease, and those fleas infected to human population. The people were also suffering from weakened immune systems due to the unsanitary conditions and malnutrition (due to food shortages) which made them more susceptible to the plague.
Yes, most of the time the immune system weeds out cells that are abnormal.
the immune system :)