atypical pneumonia

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a·typ·i·cal pneu·mo·ni·a

pneumonia caused by a nonbacterial pathogen, classically caused by Mycoplasma pneumoniae, but generally used to refer to any nonbacterial pneumonia with mild systemic symptoms, including viral. See: primary atypical pneumonia.

atypical pneumonia

Etymology: Gk, a + typos, without type, pneumon, lung, ia, condition
a group of relatively mild symptoms of chills, headache, muscular pains, moderate fever, and coughing, but without evidence of a bacterial infection. Chest x-ray film may show mottling at the bases of the lungs. Eaton agent, or Mycoplasma pneumoniae, may be the cause of the symptoms.

atypical pneumonia

A clinically “atypical” form of pneumonia, which lacks the classic signs and symptoms of bronchopneumonia.
Chlamydial pneumonia, Mycoplasma, influenza A or B, adenovirus, Legionella.
Antibiotics if bacterial, otherwise supportive.
Symptoms usually improve within two weeks.

atypical pneumonia

Chest medicine A clinically 'atypical' form of pneumonia, which lacks the classic signs and Sx of pneumonia Types Chlamydia pneumonia, Mycoplasma, influenza A or B, adenovirus, Legionella Management Antibiotics if bacterial Prognosis Sx often improve in < 2 wks

pri·mar·y a·typ·i·cal pneu·mo·ni·a

(prī'mar-ē ā-tip'i-kăl-nū-mō'nē-ă)
An acute systemic disease with involvement of the lungs, caused by Mycoplasma pneumoniae and marked by high fever, cough, relatively few physical signs, and scattered densities on x-rays; usually associated with development of cold agglutinins and antibodies to the bacteria.
Synonym(s): atypical pneumonia, mycoplasmal pneumonia.


inflammation of the parenchyma of the lung. It is often accompanied by inflammation of the airways and sometimes of the adjoining pleura. Clinically it is manifested by an increase in the rate and depth of respiration at all degrees of severity up to dyspnea. There is also cough, and abnormality of the breath sounds on auscultation. In bacterial pneumonia there is usually a severe toxemia, in viral pneumonia it is usually minor. See also bronchopneumonia, pleuropneumonia.

Arabian foal pneumonia
an inexorably progressive pneumonia of certain Arabian foals born with primary severe combined immunodeficiency in which adenovirus plays a dominant role but is complicated by other microorganisms, particularly Pneumocystis carinii.
aspiration pneumonia
see aspiration pneumonia.
atypical pneumonia
histologically the pneumonia is atypical in that there are no signs of acute inflammation and it is characterized by an exudation of eosinophilic, protein-rich fluid in the alveoli which may become organized to form a hyaline membrane. In animals that survive for several days there is epithelialization of the alveolar walls. In humans there is a primary atypical pneumonia caused by Mycoplasma pneumoniae. In animals the best known example is atypical interstitial pneumonia of cattle.
bronchointerstitial pneumonia
the lesions are centered on the bronchioles and a prominent feature is the accumulation of lymphocytes in interstitial tissue; typical of pneumonias caused by aerogenous virus infections, especially myxoviruses.
brooder pneumonia
see brooder pneumonia.
chronic undifferentiated pneumonia of sheep
see enzootic pneumonia.
corynebacterial pneumonia of foals
see corynebacterial pneumonia.
cuffing pneumonia
chronic undifferentiated pneumonia of sheep in which lymphofollicular sheaths around the bronchioles are a feature.
equine cryptococcal pneumonia
see epizootic lymphangitis.
desquamative pneumonia
a chronic pneumonia associated with Mycoplasma spp. and characterized by organization of the exudate within bronchioles and bronchi, and proliferation of the interstitial tissue and epithelium.
desquamative interstitial pneumonia
chronic pneumonia with desquamation of large alveolar cells and thickening of the walls of distal air passages; marked by dyspnea and nonproductive cough.
embolic pneumonia
results from hematogenous spread from an intravascular lesion elsewhere in the body. The best known example is caudal vena caval thrombosis.
endogenous-lipid pneumonia
focal alveolar accumulations of foamy, lipid-filled macrophages which may impede alveolar clearance. Usually an incidental postmortem finding in laboratory rodents, fur-bearing animals and uncommonly cats and dogs.
enzootic pneumonia
see enzootic pneumonia.
fibrinous pneumonia
an acute fulminating pneumonia, often lobar in distribution, characterized by a fibrinous exudate. Fibrinous describes the exudate, not the anatomical distribution so that the term fibrinous pneumonia should not be used interchangeably with lobar pneumonia.
foreign body pneumonia
see aspiration pneumonia.
gangrenous pneumonia
usually an accompaniment of aspiration pneumonia.
giant-cell pneumonia
a secondary lesion in dermatosis vegetans in pigs; lesions marked by the presence of a proliferative giant-cell type of diffuse interstitial pneumonia.
granulomatous pneumonia
has a slow course characterized by granulomatous, not exudative, lesions. Sporadic cases occur in immunodeficient animals. It is a characteristic of tuberculosis and systemic fungal infections, e.g. coccidioidomycosis.
hypostatic pneumonia
caused by pooling of blood and some decrease in viability of the dependent lung in an old, sick or debilitated animal that is in lateral recumbency for a long period. The infection is secondary to hypostasis.
inhalation pneumonia
see aspiration pneumonia.
interstitial pneumonia
pneumonia in which there is diffuse or patchy damage to alveolar septa widely distributed through the lungs. There is an early intra-alveolar exudative phase followed by significant proliferation and enlargement of the alveolar epithelial cells and a thickening of the interstitial tissue. Most interstitial pneumonias in animals are infectious including viral, bacterial, fungal and protozoal causes, but may be caused by chemical injury, acute pancreatitis or shock, as in acute respiratory distress syndrome.
lipid pneumonia
a specific type of aspiration pneumonia caused by the inhalation of oil droplets; most commonly associated with the forced administration of paraffin oil or cod-liver oil to cats. Called also medication pneumonia, lipoid pneumonia. See also aspiration pneumonia.
lobar pneumonia
a fulminating bronchopneumonia in which entire pulmonary lobes are diffusively inflamed and then consolidated. Pneumonic pasteurellosis in cattle is the type disease. The animal is critically ill with anoxia and toxemia.
lobular pneumonia
an oldfashioned term for bronchopneumonia.
lymphoid interstitial pneumonia
see maedi.
ovine progressive pneumonia
see maedi.
parasitic pneumonia
see lungworm disease.
stable pneumonia
see equine influenza.
suppurative pneumonia of foals
see corynebacterial pneumonia.
uremic pneumonia
occurs in dogs with terminal uremia; lesions characterized by absence of inflammatory cells.
References in periodicals archive ?
At the special meeting of China-ASEAN leaders on Atypical Pneumonia on April 29, 2003, Wen reported what the Chinese government had done in fighting SARS.
pneumoniae cause nearly 80% of all cases of atypical pneumonia and approximately 17% of all pneumonia among adults and young children, accounting for an estimated two to three million cases of pneumonia and 200,000 pneumonia-related hospitalizations in the United States each year.
Tsang said that in one week he visited three male patients suffering from atypical pneumonia, but they had since died.
To evaluate use of these two methods in support of clinicoradiological diagnosis in diagnosis and timely treatment of cases of atypical pneumonia.
All atypical pneumonia pathogens cause systemic infectious disease.
A clinical report on cases of primary atypical pneumonia caused by a new virus.
If you see a child or an adult with atypical pneumonia, ask if there is a bird in the home.
SARS, an atypical pneumonia caused by a new coronavirus, first emerged in southern China in late 2002 and then spread rapidly worldwide.
The CMoH case definition differs principally by including pneumonia patients whose contacts SARS and by requiring radiographic evidence of atypical pneumonia.
Pulse oximetry measurements were normal to mildly reduced on admission, but chest x-rays uniformly showed evidence of consolidation and interstitial infiltrates, consistent with atypical pneumonia.
Officials from both the airline industry and the Osaka Regional Immigration Bureau's Kansai International Airport branch on Friday cited the war on Iraq and the global spread of the deadly atypical pneumonia as the causes of the plunge in passenger traffic.

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