SCHOOLS are issuing warnings about whooping cough after a spate of cases in the Mount Martha area. It is understood there have been cases recorded at Balcombe Grammar and Mount Martha Primary School. There are fears that families may not be aware of the easy spread of the infection, which requires all sufferers to be on antibiotics for at least five days.In Victoria, children with pertussis (whooping cough) but who have not had the required antibiotic treatment must not go to primary school and children’s service centres for 21 days after the onset of the cough. Unimmunised contacts under seven…