The genus Streptococcus is comprised by the Gram-positive, microaerophilic cocci or round bacteria, which are not motile and arise in chains or pairs as observed by means of microscopy under the microscope like the binocular compound microscope. The genus is described by a mixture of antigenic, hemolytic and physiological features into Groups A, B, C, D, F and G. Groups A and D can be transferred to humans through infected food. Group A has one species the Streptococcus pyogenes with forty antigenic types. The group D has five species such as Streptococcus avium, Streptococcus faecalis, Streptococcus bovis, Streptococcus faecium and Streptococcus durans.
Group A symptoms are septic sore throat and scarlet fever as well as other pyogenic and septicemic contaminations. The victim may experience high fever, headache, and nausea, sore and red throat, pain on swallowing, rhinorrhea, malaise and sporadic rashes. The duration is usually one to three days and the infective dose is possibly not more than one thousand organisms as examined through microscopy using a microscope such as binocular compound microscope. Group D may generate a clinical manifestation analogous to staphylococcal poisoning like abdominal cramps, nausea, fever, chills, diarrhea, vomiting and dizziness in two to thirty-six hours following the consumption of suspected food, the infective dose is possibly more than one hundred seven organisms as observed by means microscopy under the microscope such as binocular compound microscope.
In order to diagnose the presence of microorganisms in group A, there is a need for the culturing of nasal and throat swabs, pus, sputum, blood, suspect food and environmental specimens, and later be examined via microscopy under the microscope such as binocular compound microscope. In group D microorganisms, there is a need to culture the fecal samples, blood, and suspected food, and later on examined through microscopy using a microscope such as binocular compound microscope.
The foods implicated in group A contamination include milk, eggs, ice cream, steamed lobster, ground ham, custard, and rice pudding among others. In nearly all instances, the foodstuffs were allowed to stand at room temperature for a number of hours between preparation and ingestion. Infection into the food is the consequence of poor hygiene, sick food handlers or the utilization of non-pasteurized milk. In group D, the food sources are sausage, evaporated milk, cheese, meat croquettes, meat pie, and raw and pasteurized milk. Contamination into the food chain is due to improper processing and or poor and unclean food preparation.
Group A contagions are low and may transpire in any season, whereas Group D contaminations are variable. In group A, Streptococcal sore throat is extremely common, particularly in children. Commonly it is successfully treated with antibiotics. Complications are rare and the mortality rate is low. In group D, diarrheal disease is poorly typified, but is acute and self-limiting.
All humans are vulnerable. No age or race vulnerabilities have been discovered. Alleged infected food is examined microbiologically by selective enumeration methods that can take up to seven days. Group specificities are identified by Lancefield group-specific antisera.