Diarrhoea

The current study is a follow-up to 2 previous parent studies, a dose-selection study with 3 different dose-levels of the altSonflex1-2-3 vaccine in a schedule of 3 vaccinations (H06\_01TP study \[NCT05073003, 212149\]) and a study with an alternate 2 vaccination schedule H06\_02TP study \[NCT06663436, 219449\]). The current study aims to assess the longevity of the immune response to the selected dose of the altSonflex1-2-3 vaccine 1, 2, and 3 years after the last vaccination in African children. The study involves no new vaccinations but will collect immunogenicity blood samples from participants.

Acute watery diarrhea is defined as the passage of 3 or more loose or liquid stools per day for 3 or more days but less than 14 days, including patients with mild to moderate dehydration per WHO classification. The study's outcome variables are stool frequency, measured by the total number of stools passed during 24 and 48 hours from the initiation of treatment, and hospital duration, measured by the total duration of hospital stay in hours. The null hypothesis states that racecadotril combined with standard treatment has no effect on reducing the mean number of stools passed during 48 hours compared to standard treatment alone in pediatric patients with acute watery diarrhea, while the alternate hypothesis suggests that racecadotril combined with standard treatment will significantly reduce the mean number of stools passed during 48 hours compared to standard treatment alone in these patients.