Catching Cold

I am afraid to sneeze around my mother. I avoid coughing in front of her, even if only to prevent the spinach piece from getting rid of the wrong tube. I have not blown my nose for more than a few seconds in front of her, nor have I hurt any part of my body. No, my mother has no abnormally weak immune system. She is not as old as he is recovering from chronic illness. In fact, my mother is one of the healthiest people I know. Her paranoia is not her own health.

One trick to maintaining health during the winter is not to "catch a cold". I believe that a cold is a kind of worm and a cold means a cold virus. However, there are hundreds of different viruses that can cause "colds everywhere". If you have a cold and your immune system is not alert you suddenly discover that you were receiving a virus that you feel is easier to replicate in your nose, throat or lung Maybe. The virus actually does not exist and actually does not die. However, if the host 's immune system is in a precautionary state they can mutate and cause occasional severe damage, so they can be considered to have some kind of awareness. Its purpose is not to let your virus "catch your body" and "make it sick".

• Random variable I (vaccination) In the case of I = 2, Glenn does not catch a cold even if Glenn is in contact with a patient with a cold and living near a corn field where pesticide is sprayed. If he does not live near the corn field where the pesticide is sprayed, there will be no cold to come in contact; if I = 0, whether I live near a corn field sprayed with pesticide, Glen will catch a cold if you are exposed to the cold. The causal relational expression is obvious. CC = 1 if C = 1 and I = 0 or I = 1 and S = 1. This figure is for Glenn's anticipated cold loss of $ 60 if 70% of the population is I = 2, 10% is I = 1, and 20 is 20 when Joe is not spraying Otherwise it is 90 dollars. The difference of $ 30 is the economic cost of spraying with Glencoe (before knowing whether Glen has a cold)