Answer:
10
Step-by-step explanation:
In the question, it is mentioned that the 16 cases were reported in March 2012. In each month, the cases were reported. Like - in February 0 cases were reported, On march 16 cases were reported and so on
So, the incidence of Cayetanosis in May 2012 was 10 cases which were reported and the same was mentioned in the question.