Used and gathered as a fertilizer from caves, horseshoe bat guano virus is transmitted like chicken litter histoplasma fungus. Used as fertilizer in Arkansas, it was spread on fields, etc. Chicken pullers carried the fungus and for some the fungal burden became high. The virus is inhaled in the same way and mutation is because of different genetics of the people who carry the virus. The fungus was carried by the people on their clothing, was airborne from fertilizer used on fields. There was no testing for histoplasmosis - diagnosis by x-ray. The way the bat virus mutates, it might have gotten more potent and those that gather the guano from caves became more resistant. The best therapy is selenium - some 25 different selenoproteins and Inositol IP6 to combat the side effects. Also Vitamin D, etc. For me, I was Iodine deficient because of a history of Fibromyalgia. This is thought to be the result of biological stress causing oxidative damage. That damage - the ROS - is repaired by a combination of iodine and selenium, ATP cofactors, magnesium. The latest research finds iodine in every cell in the body. As far as the eye problems associated with the virus, the same is true of Histoplasmosis - some people go blind from it. As much as China loves the guano fertilizer, I began to wonder if some of it was here in the US being imported. The disease was on ships in middle of the ocean maybe as a delicacy, it has been in port cities. The focal points of the disease could not be explained. But whatever, people will have to beef up their immune systems because I doubt China will let go of bat guano farming. I am guessing, that is how the piglets got it. I am also guessing the lab in China was not necessarily a source - it was the guano gatherers who work with this all the time. But there is money in guano and I doubt China wanted to give this up. It is also part of their tradition. Loss of ability to smell might be the first indication of viral infection but might not be noticed by smokers, etc.