The<unk>  (from the "nose", , romanized: "of the nose", and the ) is the most common viral infectious agent in humans and is the predominant cause of the common cold.<unk>  infection proliferates in temperatures of 33–35 °C (91–95 °F), the temperatures found in the nose.<unk> es belong to the genus Enterovirus in the family Picornaviridae. The three species of<unk>  (A, B, and C) include around 160 recognized types of human<unk>  that differ according to their surface proteins (serotypes). They are lytic in nature and are among the smallest viruses, with diameters of about 30 nanometers. By comparison, other viruses, such as smallpox and vaccinia, are around ten times larger at about 300 nanometers, while flu viruses are around 80–120 nm. History == In 1953, when a cluster of nurses developed a mild respiratory illness, Winston Price, from the Johns Hopkins University, took nasal passage samples and isolated the first<unk> , which he called the JH virus, named after Johns Hopkins. His findings were published in 1956.
Rhinovirus
Echovirus
Arbovirus
Respiratory syncytial virus
Human parainfluenza viruses
Poliovirus
Influenza B virus
Influenza A virus