Symptoms include mild headaches, muscle pain, fever, a persistent cough and sometimes vomiting and diarrhoea.

BBC: Legionnaires' Disease bacteria

Whooping cough, or pertussis, may look like just like a cold or a persistent cough in adults.

CNN: 9th baby in California dies from whooping cough

Mr Golby was referred to the University Hospital Coventry in May 2010 after visiting his GP with a persistent cough.

BBC: Coventry hospital pays over Frank Golby lung cancer death

Symptoms are similar to those felt by humans: a persistent cough, thick nasal discharge and in severe cases, fever and respiratory distress.

WSJ: A New Breed of Flu Shot to Avoid Getting Sick as a Dog

It looked at 2, 061 patients who had a persistent cough lasting more than 28 days and where a chest infection, like bronchitis, was suspected.

BBC: Antibiotics 'ineffective for coughs'

Older children and adults who have whooping cough often appear to have a bad cold or persistent cough that can be so severe that it causes vomiting.

CNN: Can breast-feeding prevent whooping cough?