Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2011 Mar 18;6(3):e18022. doi: 10.1371/journal.pone.0018022

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Tan et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

The Classification and Regression Tree (CART) split the data by year of isolation, describing 3 temporal periods: 1985–1987, 1988–2000 and 2001–2005. The change in proportion was observed for each virus group, with HEV-B further divided into Echoviruses and Coxsackieviruses, while Poliovirus was regarded as separate from HEV-C.