Search results for "WHO"
showing 10 items of 829 documents
Acute Laryngitis in the Rat Induced by Moraxella catarrhalis and Bordetella pertussis: Number of Neutrophils, Dendritic Cells, and T and B Lymphocyte…
1999
Infectious laryngotracheitis results in fulminant respiratory distress. During the disease, the subglottic mucosa is selectively infected and swollen, the reason for this preference being unknown. Therefore, in the present study the immunoreaction of the laryngeal mucosa was studied in the rat after inhalation of either heat-killed Moraxella catarrhalis (PVG rats) or application of viable Bordetella pertussis (BN rats). The number of neutrophils, macrophages, dendritic cells, and T and B lymphocytes was determined in the mucosa of the supraglottic, glottic, and subglottic area of the larynx as well as in the trachea. After application of the pathogens, the mucosa of the subglottic area was …
Persistence of protection through 33 months of age provided by immunization in infancy with two three-component acellular pertussis vaccines
1998
Abstract A large, randomized, placebo-controlled clinical trial in Italy on two three-component pertussis vaccines, given as DTaP in infancy, one manufactured by SmithKline and Beecham (SB) and one by Chiron Biocine (CB), found each vaccine to be 84% efficacious through the average age of 24 months. The cohort of children envolled in the trial was followed with unmodified case ascertainment procedures for nine additional calendar months, during which partial unblinding occurred, for the unvaccinated randomized group. For the DTaP groups, the specific vaccine assignment remained double-blinded throughout the entire additional observation period. Pertussis was defined as paroxysmal cough last…
Analogous IgG subclass response to pertussis toxin in vaccinated children, healthy or affected by whooping cough
2003
The study of antigen specific IgG subclass distribution during disease, or during any other natural or artificial immunisation, can provide useful information on the kind of the immune response and the expected levels of protection. This is particularly true for diseases, such as pertussis in which the mechanisms underlying specific defence are still not completely understood. An investigation was therefore performed to evaluate the IgG subclass response to pertussis toxin (PT) in sera from 89 healthy vaccinated children and 131 vaccinated or unvaccinated children convalescent after a confirmed B. pertussis symptomatic infection. Antibody titres were expressed in arbitrary ELISA units/ml, a…
Comparative study of a whole-cell pertussis vaccine and a recombinant acellular pertussis vaccine.
1994
The safety and immunogenicity of an acellular pertussis vaccine containing the genetically detoxified pertussis toxin PT-9K/129C, filamentous hemagglutinin, and pertactin, together with diphtheria and tetanus toxoids, were compared with those of a whole-cell pertussis component-diphtheria-tetanus vaccine. Four hundred eighty infants were enrolled into this prospective, multicenter, double-blind study. Each infant was randomly given three doses of one of the two vaccines at 2, 4, and 6 months of age. Both local and systemic adverse reactions, reported within 48 hours and 7 days of each injection, were less frequent after the acellular vaccine than after the whole-cell vaccine. The enzyme-lin…
Pertussis in adults with persistent cough: a prospective follow up study in primary care.
2009
Despite high coverage of pertussis vaccine, B. pertussis has remained endemic and adults are recognized as reservoir for infection among incompletely immunized infants. Between November 15th 2004 and November 14th 2006, 37 general practitioners, attending 56,658 adults, recruited all patients with persistent cough. A diagnosis of pertussis was considered in those with an unexplained cough, lasting 14 or more days and a positive polymerase chain reaction (PCR) or enzyme-linked immunosorbent assay (ELISA) IgG anti-Pertussis Toxin (PT). During the period of the study 86 patients presented with persistent cough (106 cases per 100,000 person-years). According to laboratory criteria, 35% were cla…
Efficacy of Acellular Pertussis Vaccine in Early Childhood After Household Exposure
1996
Objective. —To evaluate the efficacy of a three-dose primary vaccination with a diphtheria-tetanus tricomponent acellular pertussis vaccine against "typical" pertussis, defined as a spasmodic cough of 21 days or longer with confirmation of Bordetella pertussis infection by culture or serology. Design. —Passive monitoring for suspected first household (index) cases of typical pertussis in six areas in Germany comprising 22 505 children vaccinated with study vaccine at 3, 4, and 5 months of age. Blinded, prospective follow-up of household contacts of index cases for incidence and progression of pertussis. Setting. —Six areas in Germany with a high incidence of pertussis. Subjects. —Four hundr…
Measurement of T Cell Activation After 16‐hr In Vitro Stimulation with Concanavalin A
2010
A flow cytometry assay that can be used to directly determine the proportion of activated T lymphocytes in human whole blood samples after stimulation with concanavalin A is presented here. Human whole blood is incubated with fluorescently labeled antibodies (against CD3, CD4, CD8, and CD69), erythrocytes are then lysed, and the samples are analyzed using a flow cytometer. The assay presented is able to differentiate between CD4+ and CD8+ T lymphocytes. Thus, it is possible to quantify both lymphocyte populations in parallel, as well as the respective proportions of activated T lymphocytes, all from one sample. An additional advantage of this assay is that it was developed to assay whole bl…
WHOLE BODY IRRADIATION INDUCES IFN-γ PRODUCTION IN BALB/c MICE BY PREVENTING THE APPEARANCE OF A Vα14+NK T DOWNREGULATORY POPULATION
2000
Lymph node cells from TNCB-immune BALB/c mice fail to produce IFN-gamma when exposed to antigen in vitro. Conversely, lymph node cells of irradiated (550 rads) BALB/c mice produce IFN-gamma. Transfer experiments show that normal BALB/c mice contain cells which suppress IFN-gamma production. These downregulatory cells are CD4(+)alpha beta(+)and rearrange the invariant V alpha 14-J alpha 281 T cell receptor alpha chain, thus belonging to the NK T cell subset. Downregulatory cells probably act by producing IL-4 as their effect is blocked by mAb to IL-4.
COVID-19 infection in cancer patients: what has been the contribution of Associazione Italiana Oncologia Medica (AIOM) to oncological care since the …
2021
High mortality rates in elderly patients or in those with underlying chronic illnesses and/or a compromised immune system is a peculiar feature of COVID-19 infection. The possible coexistence of a cancer and COVID-19 infection in the same individual prompted concerns regarding their synergistic effect on prognosis. In order to balance patients’ needs with the risks related to the infection, the question oncologists have asked from the beginning of the first wave of the pandemic has been: ‘how can we deal with COVID-19 infection in cancer patients?’ In pursuing its mission, the Associazione Italiana Oncologia Medica (AIOM) has made every possible effort to support cancer patients, health car…
Erythropoietin restores the anemia-induced reduction in radiosensitivity of experimental human tumors in nude mice
2003
Abstract Purpose The effect of recombinant human erythropoietin (rhEPO) on the radiosensitivity of human tumor xenografts growing in anemic and nonanemic nude mice was studied. Methods and materials Anemia was induced by total body irradiation ([TBI], 2 × 4 Gy) of mice before tumor implantation into the subcutis of the hind leg. The development of anemia was prevented by rhEPO (750 U/kg s.c.) given 3 times weekly starting 2 weeks before TBI. Fourteen days after fractionated TBI (tumor volume of approx. 40 mm 3 ), single-dose irradiation of the tumor with varying doses was performed so that in full dose–response relationship for the probability of tumor cure was obtained. Results Radiation-i…