This photograph depicts a dorsal view of a female “lone star tick”, Amblyomma americanum. An ixodid or “hard” tick, A. americanum is found through the eastern and south-central states and can transmit disease agents that affect humans, dogs, goats, and white-tailed deer. Representatives from all three of its life stages aggressively bite people in the southern U.S. Lone star ticks transmit Ehrlichia chaffeensis and Ehrlichia ewingii, both of which cause disease. Borrelia lonestari, a pathogen associated with “Southern tick-associated associated rash illness” (STARI), also infects lone star ticks. Research suggests that up to 10% of the lone star ticks in an endemic area can be infected with any one of these pathogens. These ticks also are infected with a spotted-fever group Rickettsia, “Rickettsia amblyommii” but it is unknown at this time if this bacterium causes disease.
The obvious white dot, or “lone star”, identified this as an adult female of the species. The reduced scutal size enables the abdomen to expand to enormous proportions when ingesting a blood meal the tick extracts from its host food source, as seen in PHIL# 8677. In the male, the scutum covers almost the entire dorsal abdomen. Also, note the four pairs of jointed legs, placing ticks in the Phylum Arthropoda, and the Class Arachnida. To view additional images related to this tick specie, see PHIL 4407, and 8677 through 8685, and 9535.
<ul><li>Photo Credit: James Gathany</li>
<li>Content Providers(s): CDC/ Dr. Amanda Loftis, Dr. William Nicholson, Dr. Will Reeves, Dr. Chris Paddock</li></ul>
2006
<table cellspacing="8" cellpadding="0" class="layouttemplate sourcetemplate" style="width:100%; clear:both; text-align:center; margin:0.5em auto; border:1px solid #555555; background:#f6f7f5;" dir="ltr" lang="en"><tbody><tr><td><img alt="US CDC logo.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/US_CDC_logo.svg/100px-US_CDC_logo.svg.png" decoding="async" width="100" height="76" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/US_CDC_logo.svg/150px-US_CDC_logo.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/US_CDC_logo.svg/200px-US_CDC_logo.svg.png 2x" data-file-width="723" data-file-height="546"></td>
<td><span class="layouttemplateargs" style="display:none;speak:none;" title="template=CDC-PHIL id%3D8676"> </span>
<p>This media comes from the <a href="https://en.wikipedia.org/wiki/Centers_for_Disease_Control_and_Prevention" class="extiw" title="w:Centers for Disease Control and Prevention">Centers for Disease Control and Prevention</a>'s <a rel="nofollow" class="external text" href="https://phil.cdc.gov/">Public Health Image Library</a> (PHIL), with identification number <b><a rel="nofollow" class="external text" href="https://phil.cdc.gov/details.aspx?pid=8676">#8676</a></b>.
</p>
<div style="font-size:smaller;">
<p><b>Note:</b> Not all PHIL images are public domain; be sure to check copyright status and credit authors and content providers.
</p>
</div>
<hr><p><span style="font-size:x-small;line-height:140%" class="plainlinks noprint"><a class="external text" href="https://commons.wikimedia.org/wiki/Template:CDC-PHIL/i18n/ar">العربية</a> | <a class="external text" href="https://commons.wikimedia.org/wiki/Template:CDC-PHIL/i18n/de">Deutsch</a> | <a class="external text" href="https://commons.wikimedia.org/wiki/Template:CDC-PHIL/i18n/en">English</a> | <a class="external text" href="https://commons.wikimedia.org/wiki/Template:CDC-PHIL/i18n/mk">македонски</a> | <a class="external text" href="https://commons.wikimedia.org/wiki/Template:CDC-PHIL/i18n/sl">slovenščina</a> | <small class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/w/index.php?title=Template:CDC-PHIL/lang&amp;action=edit">+/−</a></small></span>
</p>
</td></tr></tbody></table>