Quantcast Classification of Protozoa - Principles of Epidemiology and Microbiology

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
environmental conditions than are the vegetative forms, the cysts are responsible for
the transmission of most protozoan infections.
2-22. CLASSIFICATION OF PROTOZOA
The pathogenic protozoa of man can be grouped into four major classes:
a. Class Rhizopoda (ameba). These organisms are characterized by finger-
like protoplasmic processes known as pseudopods (false feet), which serve as organs
of locomotion and for the engulfment of food. They multiply by binary fission during the
motile stage, in which they are known as trophozoites. Many species form cysts, which
consist of several nuclei and a resistant membrane (figure 2-11B). The trophozoites are
very susceptible to injurious agents and are easily destroyed; however, the cysts are
quite resistant. The cysts, therefore, are responsible for transmitting disease. Amebae
of man are found primarily in the digestive tract.
b. Class Ciliata (ciliates). The ciliates are characterized by an oval, uniformly
shaped cell having two nuclei (macronucleus and micronucleus) and numerous short,
hair-like appendages (cilia) for locomotion (figure 2-12 A). Some species multiply by
binary fission and some by conjugation. Cysts are not commonly encountered, but
when found, they are double walled, spherical bodies. The only species pathogenic to
man is Balantidium coli, a natural inhabitant of the large intestine of the domestic hog.
c. Class Mastigophora (flagellates). The flagellates are distinguished by
having, at some time during the life cycle, relatively long, filamentous protoplasmic
processes of locomotion known as flagella (figure 2-13 A). The flagella may be multiple
or single. Multiplication is by binary fission. Some species produce cysts, while others
do not. Flagellates of man are normally found in the intestinal tract, the genital tract,
and the circulatory system.
Figure 2-11. Entamoeba histolytica.
MD0151
2-30



Medical News
They said “Yes”: The attitude that defines Stanford Bio-X
I write a lot about interdisciplinary research (it’s my job),...
scopeblog.stanford.edu
Compromise Reached on Vets' Healthcare
WASHINGTON (MedPage Today) -- Congressional leaders appear to have reached...
medpagetoday.com
Florida 'Gun Gag' Angers Medical Societies
(MedPage Today) -- Medical societies condemned the federal court decision...
medpagetoday.com
Time of arrival at hospital impacts time to treatment and survival of heart attack patients
Going to the hospital for a heart attack during evenings,...
medicalxpress.com
Induced pluripotent stem cell mysteries explored by Stanford researchers
Induced pluripotent stem cells, also called iPS cells, made from...
scopeblog.stanford.edu
Informal child care significantly impacts rural economies, study finds
The child care industry has grown significantly in recent years,...
medicalxpress.com
Minor Changes in Kidney Function With RA Drug
(MedPage Today) -- Slight increases in serum creatinine levels were...
medpagetoday.com
Generation of tanners see spike in deadly melanoma
(AP)—Stop sunbathing and using indoor tanning beds, the acting U.S....
medicalxpress.com
Fear: How Statistics Can Spin Out of Control (CME/CE)
(MedPage Today) -- Loss of consciousness may be statistically associated...
medpagetoday.com
Penn team makes cancer glow to improve surgical outcomes
The best way to cure most cases of cancer is...
medicalxpress.com
IOM Panel Suggests Sweeping Changes To Doc Training
(MedPage Today) -- An expert panel recommended Tuesday completely overhauling...
medpagetoday.com
App for headache sufferers shows success
A unique app that helps headache sufferers to record the...
medicalxpress.com
It's 'Buyer beware' for decorative contact lenses, FDA says
(HealthDay)—Decorative contact lenses may seem like a fun accessory, but...
medicalxpress.com
Vibrating Capsules and Constipation: The Gastro and Endo News Report
(MedPage Today) -- A regular update on what?s new in...
medpagetoday.com
ACP expert discusses risks of biocontainment laboratories
(HealthDay)—The risks emanating from biocontainment laboratories should be prevented by...
medicalxpress.com
Top Sierra Leone doctor dies of Ebola
(AP)—Authorities say the top doctor treating Ebola in Sierra Leone...
medicalxpress.com
Malaria vaccine shows continued protection during 18 months of follow-up
A vaccine previously shown to reduce malaria in young infants...
medicalxpress.com
Urbanization of rural Africa associated with increased risk of heart disease and diabetes
The increasing urbanisation of rural areas in sub-Saharan Africa could...
medicalxpress.com
Medicine X spotlights mental health, medical team of the future and the “no-smartphone” patient
Innovative thinkers and thought leaders engaged in using emerging technologies...
scopeblog.stanford.edu
Medicine X spotlights mental health, medical team of the future and the “no-smartphone” patient
Innovative thinkers and thought leaders engaged in using emerging technologies...
scopeblog.stanford.edu
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +