They're the most common cause of stomach bugs (gastroenteritis) in the UK. Each year, it's estimated that between 600,000 and 1 million people in the UK catch norovirus. The illness is sometimes called the winter vomiting bug because it's more common in winter. However, you can catch the virus at any time of the year.hey're the most common cause of stomach bugs (gastroenteritis) in the UK. Each year, it's estimated that between 600,000 and 1 million people in the UK catch norovirus. The illness is sometimes called the winter vomiting bug because it's more common in winter. However, you can catch the virus at any time of the year.
On the contrary, individuals who are carriers for the sickle cell disease (with one sickle gene and one normal hemoglobin gene, also known as sickle cell trait) have some protective advantage against malaria.
The cause of malaria is an infection with a malaria parasite. There are several types of malaria parasites, each belonging to the genus Plasmodium.hile an infection with a Plasmodium parasite actually causes malaria, there is another important species in malaria transmission. This is the Anopheles mosquito. Anopheles mosquitoes are important because they actually transmit Plasmodium to humans through a bite.