Final answer:
The most likely cause of gastroenteritis in a 10-month-old child is a viral infection, with rotavirus being the common pathogen in children. Viral gastroenteritis is prevalent due to less developed immunity and hygiene in children compared to adults.
Step-by-step explanation:
A 10-month-old child diagnosed with gastroenteritis is most likely suffering from a viral infection. In the developing world, and in children especially, viral infections are a predominant cause of gastroenteritis. The rotavirus is frequently identified as the causative agent in children, with worldwide statistics indicating that around 70% of childhood gastroenteritis is viral. Other common viruses include norovirus and astrovirus. These viruses are highly transmissible among children due to factors such as less developed immunity and hygiene practices compared to adults.
While bacteria, parasites, and food allergies can also cause gastroenteritis, they are less likely to be the cause in comparison to viruses in this age group. Ensuring proper hygiene, administering a rotavirus vaccine, and conducting thorough handwashing can help in preventing the transmission of these viruses.