Other types of viruses are Coxsackie virus, Respiratory Syncytial virus and Echovirus. They cause the usual cold-like symptoms with congestion, sore throat, cough, fever and muscle aches. It takes several years for an infant to gain immunity to the majority of these organisms. Spread of Viruses Viruses are spread by contact with infected individuals. It is easy to see how infants and toddlers can spread the organisms to their playmates.
Adults have a tendency to kiss infants which can spread the germ.
Our immunity tends to be low when we are sick, but we still seem to only get one cold at a time. This is because the virus produces a protein that inhibits infection by any other virus you may come in contact with. This protein is called interferon and is being used as a treatment for several diseases. Unfortunately, we have not been able to produce a medicinal form that can be used to prevent colds. Even if this was developed there is a good argument against using it on everybody because before long, nobody would have immunity to any viruses.