There are around 25,000 known species of bee worldwide (about 4000 species in the US, and over 250 species in Britain)....and there are probably more to be discovered! These 25,000 species can be divided into over 4000 genera (types of bees) belonging within 9 groups or 'families', all under the banner - or 'Super-family' - 'Apoidea'. Apoidea also includes 'sphecoid wasps', from which bees are believed to be descended. Click here to read about honey bees.
Infection with Naegleria causes the disease primary amebic meningoencephalitis (PAM), a brain inflammation, which leads to the destruction of brain tissue. Initial signs and symptoms of PAM start one to 14 days after infection and include headache, fever, nausea, vomiting and stiff neck. As the amebae cause more extensive destruction of brain tissue, this leads to confusion, lack of attention to people and surroundings, loss of balance, seizures and hallucinations.
What are the symptoms of Norwalk-like viruses? The signs and symptoms of Norwalk-like viruses are similar and usually occur between 24 hours and 48 hours after exposure. They include nausea, vomiting, diarrhea, abdominal pain, muscle aches, headache, tiredness and low-grade fever. Symptoms typically last 24 hours to 48 hours and subside on their own.