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abdominal admitted affected aged antibodies attack bacteria bacteriological birds Bornholm disease Brighton outbreak canteen carriers caused cent chickenpox clinical features contacts contaminated convalescent Coseley days later deaths developed diagnosis diarrhoea diphtheria disinfection Eastbourne England and Wales enteric fever epidemic examination factory faeces food poisoning four germs headache Hlth hospital ice-cream illness immunization incubation period isolated laboratory large number lead poisoning lesions lung meat medical officer mild milk Ministry of Health Monthly Bull mortality negative notified nurses occurred officer of health onset organism pain paratyphi paratyphoid fever parrots patients pneumonia poliomyelitis psittacosis public health pyrexia rash respiratory Rickettsia Rickettsia burneti salmonella sausage smallpox source of infection spread of infection staff staphylococcal food poisoning staphylococci Staphylococcus aureus stools suffering swabs symptoms synthetic cream taken temperature tion titre Todmorden traced typhi typhoid fever usually vaccination virus vomiting ward weeks