Presence of anti-chikungunya IgG by age (years) in febrile patients, southern Sri Lanka, 2007.

<p>Presence of anti-chikungunya IgG by age (years) in febrile patients, southern Sri Lanka, 2007.</p

Phylogenetic relationship of Sri Lankan chikungunya virus (CHIKV) isolates.

<p>Sequences corresponding to the CHIKV structural genes from the six Sri Lankan isolates were compared to published CHIKV sequences [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B6" target="_blank">6</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B8" target="_blank">8</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B10" target="_blank">10</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B11" target="_blank">11</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B16" target="_blank">16</a>]. Region of isolation is indicated by text color: West Africa (Red), Asia (Blue), East/South/Central Africa (Green), Reunion Island (Pink) and India/Sri Lanka (Orange). Isolates from the current study are indicated in bold-italics.</p

Age distribution of patients with and without acute chikungunya infection, southern Sri Lanka, 2007.

<p>Age distribution of patients with and without acute chikungunya infection, southern Sri Lanka, 2007.</p

Distribution of febrile patients with and without acute chikungunya infection by month, southern Sri Lanka, 2007.

<p>Distribution of febrile patients with and without acute chikungunya infection by month, southern Sri Lanka, 2007.</p

Alignment of the amino acid sequence surrounding the chikungunya virus E1-226 region.

<p>Amino acid sequence corresponding to the E1 gene was translated from the nucleotide sequences of the three Sri Lankan isolates and compared the amino acid sequences of the isolates described in Schuffennecker et al 2006, PLoS Med and Kumar et al 2008, JGV [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B10" target="_blank">10</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082259#B11" target="_blank">11</a>]. Position E1-226 is highlighted (E1-226 corresponds to position 1035 in the polyprotein). </p