i need date about the prevalence rate of whooping cough among children under five years, specially i need the specific objectives of this thesis topic?
It is a contagious disease, with indeed a relative long duration, but I think that you should rather seek information about incidence of pertussis (whooping cough). It is a routinely collected information in countries with surveillance system, and data from Europe you can find for example in ECDC atlas: https://atlas.ecdc.europa.eu/public/index.aspx