[1] Univ Autonoma Yucatan, Ctr Invest Reg Dr Hideyo Noguchi, Dept Patol Trop, Fac Med, Merida, Yucatan, Mexico
[2] Univ Autonoma Yucatan, Dept Biol Celular, Merida, Yucatan, Mexico
[3] Gen Hosp Ohoran, Merida, Yucatan, Mexico
[4] Univ Texas, Med Branch, Dept Pathol, Galveston, TX 77550 USA
[5] Univ Texas, Med Branch, WHO Collaborating Ctr Trop Dis, Galveston, TX 77550 USA