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

editorial

. 2015 Mar 26;1(1):1–3. doi: 10.1093/ve/vev001

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

© The Author 2015. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Figure 1. — (a) Number of scientific articles using the terms ‘virus evolution’ or ‘virus’ in Thomson Reuters Web of Science between 1980 and 2015. Solid line: topic = (virus evolution) OR title = (virus evolution). Dashed line: topic = (virus) OR title = (virus), subtracting the numbers shown in the solid line. (b) Relative frequency of the term ‘virus evolution’ in the corpus of books published in English between 1940 and 2008. Data from Google’s Ngram Viewer (https://books.google.com/ngrams).