PubMed Health⌕ Search

Biomedical subjects

P Olcén

Publications and source records attributed to P Olcén.

6 recordsLinked to original sources
PubMed1979

Culture diagnosis of meningococcal carriers: yield from different sites and influence of storage in transport medium.

Different specimens and techniques have been used in the diagnosis of carriers of Neisseria meningitidis, reflecting the uncertainty about the optimal diagnostic procedure. In the present investigation the culture yield of meningococci from throat specimens was compared to that from nasopharyngeal speimens in 178 persons: 44 carriers were diagnosed. All of them were detected by culture of throat specimens while 34% of them would have remained undiagnosed if only nasopharyngeal specimens had been examined. Storage of throat specimens in a transport medium for 24 hours before culture gave a negative culture for meningococci in 41% of the carriers. This loss was surprisingly high, the reasons for which are discussed.

Carrier State↗
PubMed1979

Rapid serotyping of groups A, B, and C meningococci by rocket-line immunoelectrophoresis and co-agglutination.

Rocket-line immunoelectrophoresis (R-LIE) with antigen containing intermediate gel, and co-agglutination utilising protein A-containing staphylococci coated with specific antibodies, were adapted for serotyping the prototypes of group B meningococci. Both were found to have the same specificity as agar gel double diffusion (AGDD) but they were more sensitive and more rapid than AGDD. R-LIE required, like AGDD, the extraction of relatively large quantities of bacteria, while the co-agglutination method, performed as a slide agglutination tests with results within a few minutes and no need of special equipment, required only a small amount of heated whole meningococcal cells. Meningococcal strains of serogroups B, C, and A from patients with carriers were serotyped and the results with all three methods were in agreement.

Agglutination Tests↗
PubMed1979

Meningitis and bacteremia due to Neisseria meningitidis: clinical and laboratory findings in 69 cases from Orebro county, 1965 to 1977.

The records for 69 patients with meningococcal disease during 13 years in Orebro County were reviewed. The mean incidence during this period was 2.0/100 000 persons/year. The age group less than 1 year had the highest incidence, 15/100 000 infants/year. The mortality was 7.2% and sequelae were found in 13% of the patients. Four factors were significantly more frequent in the 7 patients with psycho-neurological sequelae: (1) Age greater than 40 years; (2) A condition prior to meningococcal disease that might have been associated with a lowered resistance; (3) Muscular hypertonia and/or marked irritability on admission; (4) Fever greater than 8 days after initiation of adequate treatment. Prodromal symptoms from the upper respiratory tract were noted in 50% of the cases. Signs and symptoms before and on admission, laboratory data and complicating events were analysed for each of 4 groups: meningitis without meningococcemia (12 patients); meningitis with meningococcemia (46): fulminant meningococcemia without meningitis (6); and benign meningococcemia (5).

Adolescent↗
PubMed1978

Laboratory identification of pathogenic Neisseria with special regard to atypical strains: an evaluation of sugar degradation, immunofluorescence and co-agglutination tests.

Sugar degradation tests (SDT) were compared with immunofluorescence (IFL) and co-agglutination (COA) tests for the diagnosis of Neisseria gonorrhoeae (GC) and Neisseria meningitidis (MC). Somewhat more than 5% of the GC strains and 8% of the MC strains were misinterpreted by SDT. On most occasions the disagreement between SDT and serological tests was due to the inability of the MC strains (less so for GC strains) to degrade sugars correctly. Because of this, three out of 15 strains (20%) from pharyngeal specimens were primarily considered to be GC by SDT but were identified as MC by COA tests. Deficiencies in sugar degradations were also found in a group of clinical problem strains. Many of them were unable or had a decreased ability to degrade glucose or maltose but were diagnosed distinctly as MC by the COA test. There were no false positives with the IFL or COA tests, but 2% of the GC strains and 26% of the MC carrier strains (non-groupable) were not identified by COA. Both IFL and COA tests are good adjuncts to SDT for the diagnosis of GC and clinically significant MC, since the results are reliable and the tests rapid and simple to perform.

Agglutination Tests↗
PubMed1978

Benign meningococcemia in childhood. A report of five cases with clinical and diagnostic remarks.

Five children aged 1/2--10 years with benign meningococcemia are reported. The clinical picture was quite uniform: good general condition, spikes of fever, skin eruptions as maculopapules--sometimes haemorrhagic, appearing in association with febrile periods, and arthralgia (big joints). The diagnosis involves either isolation of meningococci (MC) from blood, demonstration of MC with immunofluorescence in skin eruptions, or a significant elevation of MC antibody titre in connection with typical clinical signs and symptoms. Important differential diagnoses are Henoch-Schönlein syndrome, disseminated gonococcal infection, septicemia of other origins, subacute bacterial endocarditis, viral infections, hypersensitivity reactions and subsepsis allergica. By co-agglutination technique, the causative agent of meningococcemia in 4 of the 5 children was shown to be MC group B. These have some features in common with gonococci, whereby an incorrect diagnosis might be suggested as demonstrated in one of our patients. The question is raised whether MC group B is the main causative agent in benign meningococcemia.

Antibodies, Bacterial↗