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Biomedical subjects

J D Cherry

Publications and source records attributed to J D Cherry.

At least 235 records · Page 13Linked to original sources
PubMedDate not supplied

Agrobacterium radiobacter and CDC group Ve-2 bacteremia.

Agrobacterium radiobacter and CDC Group Ve-2 are rare human pathogens. The simultaneous infection with both of these bacteria in an immunocompromised host is reported. Review of the UCLA microbiology laboratory records revealed one additional case of A. radiobacter bacteremia and two additional cases of CDC Group Ve-2 bacteremia over a 3-year period. The clinical experience with these organisms is reviewed. Both organisms are opportunistic pathogens with a predilection for patients with foreign bodies in place. Although CDC Group Ve-2 bacteremia may respond to antibiotic therapy alone, the cure of A. radiobacter infections often requires foreign body removal.

Adolescent↗
PubMedDate not supplied

[The microagglutination test--a simple and sensitive procedure for serodiagnosis of pertussis infections].

The microagglutination assay is a useful method for the diagnosis of B. pertussis infections. In a group of 30 patients with culture proven pertussis 27 (90%) had > or = fourfold increases in titers between acute and convalescent phase serum specimens. The microagglutination test offers several advantages over other more sophisticated B. pertussis antibody tests: only 50 microliters of serum is required, it is a standardized test, which doesn't require specialized technical expertise or equipment, it is easy to perform and good results are noted in a broad age range of patients. Disadvantages of the microagglutination test are: two separate serum specimens are necessary (acute and convalescent phase), the test does not differentiate IgA and IgG antibodies and the temporal association with recent immunization can lead to false positive results. In our opinion the microagglutination test is a useful method for the diagnosis of B. pertussis infections. This is especially true in cases where more sophisticated serologic tests such as ELISA can not be performed immediately but physicians and patients expect to get a result quickly.

Adolescent↗
PubMedDate not supplied

Antigenicity and reactogenicity of influenza A/USSR/77 virus vaccine in children--a multicentered evaluation of dosage and safety.

Clinical trials of monovalent A/USSR/77 (H1N1) and trivalent A/USSR/77 (H1N1), A/Texas/77 (H3N2), and B/Hong Kong/72 inactivated influenza virus vaccines were carried out in 358 children and adolescents. Only split-virus vaccines were administered to children younger than 13 years of age. No serious local or systemic reactions were observed among the study participants. Two doses of vaccine containing 7-20 micrograms of the A/USSR/77 (H1N1) viral antigen were required to achieve serum titers of hemagglutinin-inhibiting (HA1) antibody greater than 1:40. However, single doses containing 7-20 micrograms of the A/Texas/77 (H3N2) or B/Hong Kong/72 antigens stimulated serum HAI antibody levels of 1:40.

Adolescent↗
PubMedDate not supplied

Selection of antimicrobial agents for initial treatment of suspected septicemia in infants and children.

Septicemia is relatively common in infants and children, and empiric antimicrobial therapy is frequently necessary. In immunocompetent children the most likely causative agents are Streptococcus pneumoniae, Haemophilus influenzae, Neisseria meningitidis, and Salmonella species. Effective empiric therapy is often the combination of ampicillin and chloramphenicol. In immunocompromised children the etiologic possibilities in septicemia include a large number of opportunistic pathogens, the most common of which are Escherichia coli and other enteric bacilli, Pseudomonas species and other hospital-related bacilli, and Staphylococcus aureus. Empiric therapy often consists of an aminoglycoside, a penicillinase-resistant penicillin or cephalosporin, and carbenicillin or ticarcillin. The third-generation cephalosporins offer considerable promise in the empiric treatment of septicemia in children.

Anti-Infective Agents↗
PubMedDate not supplied

Longitudinal study of influenza B symptomatology and interferon production in children and college students.

A longitudinal study of symptomatology and interferon production in 35 patients (13 children, 20 college students and 2 medical staff members) with influenza B viral infections is presented. The mean duration of illness was 11.3 days. Cough persisted for 9.8 days and nasal symptoms continued for 8.5 days. The mean duration of fever was 4.7 days. Diarrhea occurred in 8 patients; it had its onset on about the fourth day and persisted for 4 days. Interferon levels correlated directly with fever and generally with systemic symptoms but not with other aspects of disease severity, duration or serum hemagglutination-inhibiting antibody responses.

Adolescent↗
PubMedDate not supplied

Effect of topical anesthetics on ciliary activity of chicken embryo tracheal origin cultures. Study using total immersion and intratracheal injection.

Because of conflicting reports concerning the effect of topical anesthetics on cilia, testing of four different agents was undertaken. The agents were hexylcaine 5% (Cyclaine), tetracaine 2% (Pontocaine), cocaine 5% and 10%, and lidocaine 4% (Xylocaine). Tracheas were removed from 19 to 20 day old chicken embryos. Ciliary activity was graded as to extent and vigor. Two methods of testing were used. In the first, dilutions of each agent were made, and tracheal rings were placed in the wells of microtiter plates and completely covered with the test drug. In the second method of testing, 0.8 ml of the test drug was injected in vivo into the exposed trachea of the embryo. In immersion testing, cilia stopping effect (CSE) in tracheal rings was noted in all drug dilutions tested within 1 to 20 minutes. When the drug was injected directly into the trachea, a complete CSE was noted the next day in the rings from the tetracine and hexylcaine injected tracheas. Three days following in vivo transtracheal injection of lidocaine and cocaine, ciliary activity in these and the control rings was similar. Although cilia did not tolerate total immersion in any of the agents tested, ciliary activity in tracheas injected with lidocaine and cocaine did not differ significantly from the control tracheal rings. Physicians who use topical anesthetics should be aware of this.

Anesthetics, Local↗
PubMedDate not supplied

Scanning electron microscopic examination of nonbeating cilia.

When cilia stop beating, their role in moving mucus ceases, but it is uncertain if nonmotile cilia preserve their external architecture and are thus capable of maintaining an additional role of retarding microbial access to the cell. Cilia of chicken embryo tracheal organ cultures were observed until their activity stopped. When examined with scanning electron microscopy, ciliary axonemes did not appear to differ significantly from normally functioning cilia when observed at lower magnifications. Since their density can remain essentially unchanged, nonbeating cilia may still have a role in protecting respiratory membrane from toxic microorganisms.

Animals↗