NATS 1670 Study Guide - Final Guide: Salivary Gland, Mitosis, Malignancy
23 Oct 2012
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1997 18 people in hong kong contracted avian influenza caused by h5n1 strain of influenza that spreads easily in chickens and other birds: half caught disease from birds (scientists thought this was impossible) Mutate quickly, picking up genes from other flu viruses: vaccine that may protect against h5n1 but as viruses mutate the vaccine is ineffective. Affect individuals who had a previously healthy immune system. As the immune system deteriorates with increasing age, older individuals has less effective immunity. Stress can lead to increased quantities of glucocorticoids which are toxic to t cells, thus suppressing cell mediated immunity: cold sores breaking out during exams. Malnutrition and environmental toxins can also cause acquired immunodeficiency diseases by inhibiting the normal production of b and t cells. Chronic diarrhea, thrush, and oral hairy leukoplakia (digestive system: often results in dementia during final stages.
