Streptococcus A ,C or G bacteria cause particularly frequent pharyngitis and sore throat in children. These infections are effectively treated with antibiotics.
However, viruses are more often the cause of these infections, in which cases, no treatment is needed as the infection will disappear on its own within a few days. Given the risk of developing resistant bacteria, it is important to use antibiotics only in proven bacterial infections. Culture media for throat samples are checked after 24 hours and 48 hours of incubation. If the culture is positive for strep A, C or G in 24 or 48 hours, a strep A, C or G infection is confirmed and antibiotic treatment will follow. If the culture is negative after 48 hours, it is very likely that the infection was viral and antibiotic treatment is not appropriate. False negative results can be obtained in individuals already on antibiotic therapy or in case of an inadequate throat sampling.