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Pertussis – or whooping cough – is an acute bacterial disease of the respiratory tract

Pertussis – or whooping cough – is an acute bacterial disease of the respiratory tract

Pertussis – or whooping cough – is an acute bacterial disease of the respiratory tract

Measles is a rash illness resulting from infection with the measles virus

Measles is a rash illness resulting from infection with the measles virus

Measles is a rash illness resulting from infection with the measles virus

Measles is a rash illness resulting from infection with the measles virus

Measles is a rash illness resulting from infection with the measles virus

Measles is a rash illness resulting from infection with the measles virus

Measles is a rash illness resulting from infection with the measles virus