academauto.shop Open in urlscan Pro
2606:4700:3036::6815:340d  Public Scan

Form analysis
2 forms found in the DOM

GET https://search.cdc.gov/search/

<form accept-charset="UTF-8" action="https://search.cdc.gov/search/" class="cdc-header-search-form" method="get" autocomplete="off">
  <!-- fallback mobile search -->
  <button class="btn btn-primary dropdown-toggle no-toggle search-button ssi d-xl-none" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" aria-label="search"><span>Search</span>
    <i class="fi cdc-icon-magnify dropdown-menu-medium-search-icon x24" aria-hidden="true"></i>
    <i class="fi cdc-icon-close dropdown-menu-medium-close-icon x24" aria-hidden="true"></i>
  </button>
  <div id="mobile-nav-toggles">
    <div class="magnifying" id="mag"><span class="sr-only">Search Menu</span></div>
    <div class="hamburger" id="ham">
      <span class="cdc-icon-menu-bars"></span>
      <span class="sr-only">Navigation Menu</span>
    </div>
  </div>
  <div class="dropdown-menu dropdown-menu-right dropdown-menu-search dropdown-menu-medium-search">
    <div class="input-group">
      <input id="headerSearch" type="text" class="form-control" maxlength="300" placeholder="Search" aria-label="Search" name="query">
      <span class="form-control-clear cdc-icon-close" style="visibility: hidden;"></span>
      <div class="input-group-append">
        <button class="btn search-submit" type="button">
          <span class="sr-only">Submit</span>
          <i class="fi cdc-icon-magnify x24 search-submit" aria-hidden="true"></i>
        </button>
      </div>
    </div>
  </div>
  <input type="hidden" name="affiliate" value="cdc-main">
</form>

https://public.govdelivery.com/accounts/USCDC/subscribers/qualify

<form id="govd-subscribe" action="https://public.govdelivery.com/accounts/USCDC/subscribers/qualify">
  <div class="form-row">
    <div class="form-group col-md-12"> <label for="gov-d-email"> <span class="sr-only">Email Address</span> <input id="gov-d-email" name="email" type="email" class="form-control" placeholder="Email Address" required="required"> </label> </div>
  </div>
  <div class="form-row">
    <div class="col-6"> <a class="explain" href="//www.cdc.gov/emailupdates/">What's this?</a> </div>
    <div class="col-6 text-right"> <button type="submit" class="btn btn-primary">Submit</button> </div>
  </div> <input id="gov-d-topic" name="topic_id" type="hidden" value=""> <input id="gov-d-origin" name="origin" type="hidden" value=""> <input id="gov-d-pop" name="pop" type="hidden" value="t">
</form>

Text Content

Skip directly to site content Skip directly to page options
Parasites
Centers for Disease Control and Prevention. CDC twenty four seven. Saving Lives,
Protecting People
Search
Search Menu
Navigation Menu
Submit
 * About Parasites
 * Diagnosis of Parasitic Diseases
 * Transmission of Parasitic Diseases
 * Information for Specific Groups
   * BACK
     Information for Specific Groups
   * Health Professionals
   * Laboratory Scientists
   * Public Health Departments
   * Women
   * Children
   * Travelers
   * Home
 * What is CDC Doing?
 * Education and Training
   * BACK
     Education and Training
   * Epi InfoTM App
   * CDC Bottle Bioassay
   * Home
 * Resources
   * BACK
     Resources
   * How to Find A Physician
   * Communication Resources
   * Parasites Glossary
   * Parasites A-Z Index
   * Laboratory Diagnostic Assistance
   * Home
 * DPDM Features
 * About Our Division
   * BACK
     About Our Division
   * DPDM Leadership
   * Home
 * Home


Parasites
 1. CDC
 2. Parasites Home

 * Facebook
 * Twitter
 * LinkedIn
 * Syndicate




ABOUT PARASITES

Español (Spanish)
minus
Related Pages


 

ON THIS PAGE

 * Protozoa
 * Helminths
 * Ectoparasites
 * Parasitic Infections



A parasite is an organism that lives on or in a host organism and gets its food
from or at the expense of its host. There are three main classes of parasites
that can cause disease in humans: protozoa, helminths, and ectoparasites.

 

 

 

 



Protozoa

Entamoeba histolytica is a protozoan. A microscope is necessary to view this
parasite. Credit: CDC.

Protozoa are microscopic, one-celled organisms that can be free-living or
parasitic in nature. They are able to multiply in humans, which contributes to
their survival and also permits serious infections to develop from just a single
organism. Transmission of protozoa that live in a human’s intestine to another
human typically occurs through a fecal-oral route (for example, contaminated
food or water or person-to-person contact). Protozoa that live in the blood or
tissue of humans are transmitted to other humans by an arthropod vector (for
example, through the bite of a mosquito or sand fly).

The protozoa that are infectious to humans can be classified into four groups
based on their mode of movement:

 * Sarcodina – the ameba, e.g., Entamoeba
 * Mastigophora – the flagellates, e.g., Giardia, Leishmania
 * Ciliophora – the ciliates, e.g., Balantidium
 * Sporozoa – organisms whose adult stage is not motile e.g., Plasmodium,
   Cryptosporidium

 



Helminths

An adult Ascaris lumbriocoides worm. They can range from 15 to 35 cm.
Credit: CDC.

Helminths are large, multicellular organisms that are generally visible to the
naked eye in their adult stages. Like protozoa, helminths can be either
free-living or parasitic in nature. In their adult form, helminths cannot
multiply in humans. There are three main groups of helminths (derived from the
Greek word for worms) that are human parasites:

 * Flatworms (platyhelminths) – these include the trematodes (flukes) and
   cestodes (tapeworms).
 * Thorny-headed worms (acanthocephalins) – the adult forms of these worms
   reside in the gastrointestinal tract. The acanthocephala are thought to be
   intermediate between the cestodes and nematodes.
 * Roundworms (nematodes) – the adult forms of these worms can reside in the
   gastrointestinal tract, blood, lymphatic system or subcutaneous tissues.
   Alternatively, the immature (larval) states can cause disease through their
   infection of various body tissues. Some consider the helminths to also
   include the segmented worms (annelids)—the only ones important medically are
   the leeches. Of note, these organisms are not typically considered parasites.

 



Ectoparasites

An adult louse. Acutal size is about as big as a sesame seed.
Credit: CDC.

Although the term ectoparasites can broadly include blood-sucking arthropods
such as mosquitoes (because they are dependent on a blood meal from a human host
for their survival), this term is generally used more narrowly to refer to
organisms such as ticks, fleas, lice, and mites that attach or burrow into the
skin and remain there for relatively long periods of time (e.g., weeks to
months). Arthropods are important in causing diseases in their own right, but
are even more important as vectors, or transmitters, of many different pathogens
that in turn cause tremendous morbidity and mortality from the diseases they
cause.
 

 



Parasitic Infections

Parasitic infections cause a tremendous burden of disease in both the tropics
and subtropics as well as in more temperate climates. Of all parasitic diseases,
malaria causes the most deaths globally. Malaria kills more than 400,000 people
each year, most of them young children in sub-Saharan Africa.

The Neglected Tropical Diseases (NTDs), which have suffered from a lack of
attention by the public health community, include parasitic diseases such as
lymphatic filariasis, onchocerciasis, and Guinea worm disease. The NTDs affect
more than 1 billion people worldwide, largely in rural areas of low-income
countries. These diseases extract a large toll on endemic populations, including
lost ability to attend school or work, stunting of growth in children,
impairment of cognitive skills and development in young children, and the
serious economic burden placed on entire countries.

However, parasitic infections also affect persons living in developed countries,
including the United States.

Back To Top



Page last reviewed: March 21, 2022
Content source: Global Health, Division of Parasitic Diseases and Malaria
homeParasites
 * About Parasites
 * Diagnosis of Parasitic Diseases
 * Transmission of Parasitic Diseases
 * Information for Specific Groupsplus icon
   * Health Professionals
   * Laboratory Scientists
   * Public Health Departments
   * Women
   * Children
   * Travelers
 * What is CDC Doing?
 * Education and Trainingplus icon
   * Epi InfoTM App
   * CDC Bottle Bioassay
 * Resourcesplus icon
   * How to Find A Physician
   * Communication Resources
   * Parasites Glossary
   * Parasites A-Z Index
   * Laboratory Diagnostic Assistance
 * DPDM Features
 * About Our Divisionplus icon
   * DPDM Leadership

Social_govd govD Get Email Updates

To receive email updates about this page, enter your email address:

Email Address
What's this?
Submit
Related Links

Neglected Tropical Diseases

Laboratory Diagnostic Assistance (DPDx)

CDC Traveler’s Health

Contact Us

For Healthcare Providers, Emergency Consultations, and General Public.

Contact Us






 * About CDC
 * Contact Us
 * 800-232-4636

Facebook Twitter Instagram LinkedIn Youtube Pinterest Snapchat
CONTACT CDC
Contact Us
Call 800-232-4636
Email Us
ABOUT CDC
 * About CDC
 * Jobs
 * Funding

POLICIES
 * Accessibility
 * External Links
 * Privacy
 * Policies
 * No Fear Act
 * FOIA
 * OIG
 * Nondiscrimination
 * Vulnerability Disclosure Policy

CONNECT WITH US
Facebook Twitter Instagram LinkedIn
Youtube Pinterest Snapchat Email

LANGUAGES
 * Español
 * 繁體中文
 * Tiếng Việt
 * 한국어
 * Tagalog
 * Русский
 * العربية
 * Kreyòl Ayisyen
 * Français
 * Polski
 * Português
 * Italiano
 * Deutsch
 * 日本語
 * فارسی
 * English

 * U.S. Department of Health & Human Services
 * Accessibility
 * External Links
 * Privacy
 * Policies
 * No Fear Act
 * FOIA
 * Nondiscrimination
 * OIG
 * Vulnerability Disclosure Policy
 * USA.gov

SAS stats

EXIT NOTIFICATION / DISCLAIMER POLICY

Close
Links with this icon indicate that you are leaving the CDC website.
 * The Centers for Disease Control and Prevention (CDC) cannot attest to the
   accuracy of a non-federal website.
 * Linking to a non-federal website does not constitute an endorsement by CDC or
   any of its employees of the sponsors or the information and products
   presented on the website.
 * You will be subject to the destination website's privacy policy when you
   follow the link.
 * CDC is not responsible for Section 508 compliance (accessibility) on other
   federal or private website.

For more information on CDC's web notification policies, see Website
Disclaimers.
Cancel Continue

CDC.GOV PRIVACY SETTINGS

We take your privacy seriously. You can review and change the way we collect
information below.

Performance Cookies Checkbox
Performance Cookies


These cookies allow us to count visits and traffic sources so we can measure and
improve the performance of our site. They help us to know which pages are the
most and least popular and see how visitors move around the site. All
information these cookies collect is aggregated and therefore anonymous. If you
do not allow these cookies we will not know when you have visited our site, and
will not be able to monitor its performance.

Functional Cookies Checkbox
Functional Cookies


Cookies used to make website functionality more relevant to you. These cookies
perform functions like remembering presentation options or choices and, in some
cases, delivery of web content that based on self-identified area of interests.

Campaign Cookies Checkbox
Campaign Cookies


Cookies used to track the effectiveness of CDC public health campaigns through
clickthrough data.

Social Media Cookies Checkbox
Social Media Cookies


Cookies used to enable you to share pages and content that you find interesting
on CDC.gov through third party social networking and other websites. These
cookies may also be used for advertising purposes by these third parties.

Remove all
Confirm Choices

CONFIRMED!

Thank you for taking the time to confirm your preferences. If you need to go
back and make any changes, you can always do so by going to our Privacy Policy
page.

Close