Abbreviations: yrs, years; sampled, number sampled; +ve, number of serologically positive samples;*, participants sex was not recorded; U/N, age not recorded.
DAX, DAS and DDDI results for Mexico City (N = 626) analyzed by age. In this case, 129 volunteers are 18 to 29 years, 198 are 30 to 39 years, 184 are 40 to 49 and 115 are 50 years or older. Mean(Stand
