Distribution of DENV-1 genotypes in recurring DENV-1 outbreaks in Malaysia. The numbers below the pie charts indicate the total numbers of DENV-1 used from each outbreak. Total numbers of DENV-1 used for 1987, 1997 and 2004 outbreaks included viruses for the period 1987–1989, 1997–1999 and 2004–2006, respectively.
Teoh et al. BMC Evolutionary Biology 2013 13:213 doi:10.1186/1471-2148-13-213