Officially, vaccinations are not required for travel to Kalutara. If you plan to stay in a four- or five-star hotel, you may not need to be concerned about vaccinations in Kalutara. However, if you intend to explore inland areas or have an extended stay of more than two weeks, it's advisable to inquire about the recommended vaccinations for Kalutara.
Generally, vaccinations for Hepatitis A, Hepatitis B, polio, and tetanus are recommended as a first priority. Getting a typhus vaccination is also a good precaution to consider. While there are mosquitoes in the resort, there have been no reported cases of malaria for a considerable period, so you may not need to get malaria vaccinations before traveling to Kalutara.