Mayaro in the americas: Surveillance/ Cross-sectional studies - Outbreaks By eyaset 1955 Causey et al 1957 Neutralization Test to SLF--cross-sectional 1960 Groot et al 1964 Neutralization Test- Cross-sectional Period: 1961 to 1962 Karbaat et al 1964 Hemaggultination Inhibition and Neutralization test cross-sectional