The universality of the genetic code refers to how the codons for amino acids are always the same in almost all species. Amino acids have corresponding nitrogenous bases in pairs of three called a codon. so to have the same amino acids, all species would need the same nitrogenous bases.
"The best description how the common cold spreads in the human body is by the replication of virus inside the respiratory track (cells of respiratory tract) of the body."
