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She added that most people affected by listeriosis will have no symptoms or experience mild diarrhoea which subsides in a few days.

A large number of children suffer from diarrhoea and pneumonia due to the poor hygiene, malnutrition and miserable living conditions, but adequate medication is rarely available.

The species is considered to be shy, and bites - though uncommon - can cause swelling, nausea and diarrhoea.

Symptoms of Ebola infection include fever, fatigue, muscle pain, headache, and sore throat, followed by vomiting, diarrhoea, rash, and internal and external bleeding.

Norovirus symptoms include nausea, vomiting and diarrhoea but a high temperature, abdominal pains and aching limbs are also common.