Zika virus cases grow in USA

<p>More than 150 pregnant women in the U.S. could be infected with the Zika virus.</p><p>And another 122 pregnant women in U.S. territories also are thought to have the disease. That&#39;s according to a report from the&nbsp;<a href="http://www.cdc.gov/mmwr/volumes/65/wr/mm6520e1.htm?s_cid=mm6520e1_w" target="_blank">Centers for Disease Control and Prevention</a>.</p><p>The CDC says most cases appear to be linked with travel and that the infections likely began outside the U.S.</p><p>Friday&#39;s numbers are a big jump from last week when the CDC said 48 women in the U.S. were believed to have the virus. But that&#39;s likely because before today, the CDC only included women in reports who were showing symptoms.</p><p>Now it includes women who are infected but don&#39;t have symptoms. The center made the change because recent research suggests pregnancies can be affected even in women who don&#39;t show any signs.</p><p>But the report doesn&#39;t include the outcomes of any of the pregnancies it&#39;s been monitoring. The Zika virus has been&nbsp;<a href="http://www.cbsnews.com/news/cdc-confirms-zika-virus-causes-microcephaly/" target="_blank">tied to birth defects</a>&nbsp;like microcephaly, which causes babies to be born with smaller-than-normal heads.</p><p>Earlier this month, Puerto Rico reported its first microcephaly case associated with Zika.</p><p><i>This video includes clips from the&nbsp;</i><i><a href="http://www.cdc.gov/mmwr/volumes/65/wr/mm6520e1.htm?s_cid=mm6520e1_w" target="_blank">Centers for Disease Control and Prevention</a></i><i>&nbsp;and&nbsp;</i><i><a href="https://www.youtube.com/watch?v=A1_SiG0yEUw" target="_blank">MSNBC</a></i><i>&nbsp;and images from Getty Images.</i></p>