A norovirus is a virus that causes viral gastroenteritis which is commonly known as the "stomach flu". Noroviruses consume a group of related ribonucleic acid (RNA) viruses. The Norovirus originated in Norwalk, Ohio in 1968. There are four norovirus genogroups (GI, GII, GIII, and GIV) and are divided into at least 20 genetic clusters.
Norovirus infections can cause several illnesses such as Stomach flu, a respiratory illness caused by influenza virus. Viral gastroenteritis is the most common illness caused by norovirus. Gastroenteritis refers to an inflammation of the stomach and intestines. Acute gastroenteritis, non-bacterial gastroenteritis, food poisoning, and calicivirus infection are other illnesses caused by norovirus infections.
Common syptoms of norovirus illness are nausea, vomiting, diarrhea, low-grade fever, chills, headache, muscle aches and fatigue.
There are no vaccine or antiviral to prevent getting sick with a norovirus.
About 300-400 outbreaks of norovirus are reported to the NESP, the National Enteric Surveillance Program at the Public Health Agency of Canada each year. Most outbreaks occur during the fall and winter season.
The H1N1 flu virus is a human seasonal flu that also circulates in pigs. It was first detected in 2009 and was referred to as the “swine flu”.
Symptoms of H1N1 virus are the same as any seasonal influenza and can include coughing, fevers, sore throat, stuffy or runny nose, body aches, headaches, chills, fatigue, nausea and vomiting. It can also lead to more serious complications, including pneumonia and respiratory failure and it can worsen the severity of chronic conditions like diabetes or asthma.
There are some antiviral drugs that are used to treat seasonal flu will work against H1N1 virus. Oseltamivir (Tamiflu) and zanamivir (Relenza) appear to be the most effective.