If we ignore all ifs & buts, then the exact temperature for melting of snow/ice is 0.01 degree C or 32.02 degree F. While answering this, we should also remember that water has a triple point at this temperature, i.e., it can exist in all the three forms - solid, liquid and gas.
Infectious diseases are caused by microorganisms such as viruses, bacteria, fungi or parasites and can spread between individuals. 1  Infectious diseases are caused by microorganisms such as viruses, bacteria, fungi or parasites. 2  Microorganisms that cause disease are collectively called pathogens.
Primary Pathogens are the microorganisms that cause diseases in healthy individual.Opportunistic Pathogens are the microorganisms that are ordinarily in contact with the host and cause disease when the host's resistance is low.