Mildez - the other thing with whooping cough is it's unlikely to pick it up in a shopping centre or public place. It is usually transmitted by a close friend and most often a member of the family (normally the mother or father although not in our case). To contract whooping cough you really need to be within a metre of the person who is infected for a time longer than just passing. They need to directly cough or sneeze or put saliva into your face. Whooping Cough does not have spores so it does not live in the environment. It is expelled from one person and sucked up by the next and then it rapidly starts to multiply 'inside' the host. This information is all a bit too late now for your DD but hopefully it will help you narrow down in your mind who might have been contagious. It's good to call those people and others who were around at the time and let them know they might need swabbing or antibiotics etc. It's also useful information for anyone else who suspect they or their LO's might have WC.