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Query: UMLS:C0032285 (pneumonia)
 54,520 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Influenza-virus-induced pneumonia of mice was consistently shown to be associated with secondary infection with coliform organisms. Treatment with gentamicin effectively sterilized the lungs of these mice but had no effect on either mortality or extent of the pneumonic process. The significance of these findings is discussed.
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PMID:The significance of secondary gram-negative coliform infection of the lungs of mice with influenzal pneumonitis. 63 30

Analysis is made of the results of the reduction program of infantile mortality which began in 1970. Said reduction dropped from 38.7 in 1970 to 22.8 per thousand live births in 1976, for a diminution of 41.5%. The early neonatal decreased from 18.2 to 12.3 per thousand live births for a drop of 32.7%. The late noenatal decreased from 5.3 to 2.30/100 live births with 57.2% reduction and the postneonatal dropped from 15.2 to 8.2 per thousand live births for a diminution of 46.5%. Infantile mortality is reported for the different departments and the order in which the main causes of death are grouped is stressed as follows; 1st, perinatal affections (B43-B44); 2nd, congenital anomalies (B42); 3rd, influenza and pneumonia (B31-B32); 4th, enteritis and other acute diarrheal diseases (B4) AND 5th, sepsis (A21). The average number of puericulture office visits per infant under 1 year of age increased from 2.7 to 6.7. Institutional births increased from 93.3 to 97.8%. The steps taken to achieve these results are described.
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PMID:[Infant mortality in cuba; analysis of a program for its reduction (1970-1976)]. 68 27

Influenza A epidemics were associated with a doubling to tripling of pneumonia rates among adult members of a prepaid medical care group studied between 1963 and 1975. Rates of influenza A associated with pneumonia increased with age. Influenza B epidemics did not have a similar effect. Overall pneumonia rates were highest in children younger than 5 years, but in this age group, other respiratory viruses dominated as causative agents. Influenza A and B epidemics were not always synchronized with those reported for the United States, and rates of influenza A infection varied between urban and suburban areas in sequential epidemics. In 1974, a year practically free from influenza A, a prolonged Mycoplasma pneumoniae epidemic kept rates of pneumonia high, especially during the summer.
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PMID:Rates of pneumonia during influenza epidemics in Seattle, 1964 to 1975. 75 28

Among 197 influenza A patients admitted to Roslagstull Hospital, abundant growth of gram-negative bacilli was found in 74 cases (38%). When assays for antibodies with the patients own strains as antigen were performed on paired sera with the indirect immunofluorescence technique, titre increases were obtained in 21 out of 55 patients (38%). In this last group signs of secondary infection, as secondary pneumonia, prolonged or recurring fever or late occurrence of leukocytosis and granulocytosis, were significantly more common than in patients without gram-negative findings. An analysis of possible interference by other bacteria did not invalidate the observations. Findings of gram-negative bacilli occurred most often in patients more than 50 years of age. The bacteria were probably hospital acquired in 32 out of 55 patients. Antibody responses took place both in the IgM and the IgG fraction.
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PMID:Colonization and clinical superinfection with gram-negative bacilli in influenza. 79 3

Respiratory tract infections represented one of the commonest illnesses that occurred among U.S. Army personnel stationed in the Republic of Vietnam. Between 1965 and 1970 the years of this review, respiratory tract infections ranked approximately equal to diarrheal disease as a cause of hospitalization or assignment to quarters. Rates varied between 20 and 110 per 1000 troops per year. The specific casual agents responsible for acute respiratory diseases in Vietnam were not defined. Limited observations suggest that members of the adenovirus group and respiratory syncytial viruses were involved. During the fall of 1968, influenza due to the A2 Hong Kong strain (H3N2) was widespread, but it was not associated with marked increases in rates of hospitalization or mortality. Mycoplasma pneumoniae was the most common demonstrable causative agent in soldiers admitted to hospitals with pneumonia, 42% in one series.
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PMID:Acute respiratory disease in the United States Army in the Republic of Vietnam, 1965-1970. 80 12

Two adolescents with acute anaerobic (putrid) lung abscess were seen during an influenza epidemic. One patient, who had a history of seizures and a dental infection, had a classic predisposition to this disease. In the second patient, the abscess was apparently acquired as a complication of influenza. In both cases, the preliminary diagnosis was staphylococcal pneumonia with pneumatocele. It is suggested that failure to consider an anaerobic cause in pulmonary infections, inappropriate specimens, transport and culture of anaerobic material, and the sensitivity of oral cavity-derived anaerobes to penicillin, serve to mask the true frequency of anaerobic lung infections in childhood and adolescence.
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PMID:Anaerobic (putrid) lung abscess in adolescence. 81 18

A human isolate of type A Hong Kong influenza virus (H3N2) was adapted to mice by serial passage. Lung homogenates from mice who received low passage levels contained about the same quantity of virus (10(6.2-6.95) 50% tissue culture infective doses/ml) as those from mice who received high passage levels (10(5.95-6.45) 50% tissue culture infective doses/ml); however, death occurred only in animals given high-passage virus. Passage 3 (P3) and passage 9 (P9) viruses were selected as representative of low-passage and high-passage viruses, respectively. Although minimal differences were detected in infectivity for rhesus monkey kidney tissue cultures and mice, P9 virus was at least 10,000 times more lethal for mice (mean lethal dose = 10(4.2)). Infection with P3 virus was accompanied by minimal bronchitis and bronchiolitis only, whereas P9-infected animals exhibited marked bronchitis, bronchiolitis, and pneumonia. Striking thymic cortical atrophy was also demonstrable in the P9-infected animals and, although virus was more commonly recovered from thymuses from these animals, immunofluorescent studies revealed only a few cells containing influenza virus antigens. To further explore the participation of thymus-derived lymphocytes in influenza, athymic nude mice and furred immunocompetent littermates were given 500 50% mouse infectious doses of P9 virus. Nude mice exhibited an increased survival time and, in contrast to the extensive lung pathology seen in furred littermates, manifested minimal cellular infiltration and no tissue destruction in lungs. Brains from nude mice exhibited encephalomalacia with lymphocytic perivascular cuffing, which was not seen in furred animals. Virus was recovered from brains of 6 of 13 nude mice and 1 of 10 furred animals. The contrasting models suggest that thymus-dependent cells play a significant role in the inflammatory response to influenza virus infection and should prove useful for probing host-virus interactions which characterize influenza virus virulence.
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PMID:Effects of low- and high-passage influenza virus infection in normal and nude mice. 83 99

During the first week of March 1974, a hospitalized patient being evaluated for hyperproteinemia and hypertension experienced fever, chills, and myalgia and showed pulmonary signs consistent with diffuse pneumonia. Subsequently, the findings from serologic tests confirmed that the patient had viral influenza. Seven other compromised hosts on the same ward developed symptoms of pneumonic influenza, and serologic data on three of the seven confirmed influenza A2. Additionally, a previously healthy young adult admitted with acute respiratory distress died of nonbacterial complications and was shown to have community-acquired influenza. The unusual features of the epidemic were the intrahospital localization of the epidemic in compromised hosts, the high rate of pneumonic complications, the low rate of secondary bacterial infection, and the severity of the viral pneumonia in the community-acquired case.
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PMID:A nosocomial outbreak of influenza A. 85 36

A prospective study on consecutively hospitalized pneumonia patients showed that 41.5% of 58 patients had a fourfold rise in the complement-fixation titer for Mycoplasma pneumoniae. Viral isolation techniques and serologic tests for influenza A1, A2 and B, parainfluenza 1 and 3, respiratory syncytial virus and the adeno virus group yielded only a single positive isolate for influenza A2. Serologic tests for melioidosis, leptospirosis, scrub, murine and epidemic typhus and psittacosis were all negative. The clinical manifestations were not distinctive for the positive M. pneumoniae patients when compared with the patients having a negative M. pneumoniae complement-fixation test. The symptoms and signs and laboratory and radiologic findings were similar to those described in other reports on primary atypical pneumonia.
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PMID:Mycoplasma pneumonia: a study on hospitalized American patients with pneumonia in Vietnam. 88 14

The evidence has been obtained indicating an increase in proteolysis in the lungs of mice within 1 1/2 - 2 1/2 hours and on the 2nd day after inoculation of the animals with 1X10(5)-1X10(6) LD50 of influenza AO/32 virus, whereas on the 5th day in the affected organ proteolysis was significantly reduced as compared to the controls. No significant differences in the levels of cateptic activity at pH 5.0 in the lungs of infected and noninfected animals were found at any intervals of the study. At 1 1/2--2 1/2 hours and 5 days postinfection the antitryptic activity of the serum was found to be increased. The increased proteolysis early in infection is considered to be a virus-induced process, while its decline on the 5th day postinfection may be of protective nature. The participation of the system of proteases and their inhibitors in influenza virus--sensitive cells interaction as well as in the pathogenesis of influenza pneumonia is suggested.
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PMID:[Proteolytic enzymes and their inhibitors in experimental influenzal infection]. 91 Apr 40


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