Browsing by Author "De Klerk, H. C."

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    Antibiotic-resistant Serratia marcescens infection in a hospital
    (HMPG, 1979-04) Ambrosio, R. E.; Van Wyk, A .J.; De Klerk, H. C.
    Over a 12-month period, 74 isolates of Serratia marcescens were obtained from various sources at Tygerberg Hospital. The majority of these isolates were from catheterized patients with urinary tract infections, and were non-pigmented and resistant to all antibiotics tested, excepting amikacin and neomycin. All isolates transferred resistance to tobramycin, gentamicin and tetracycline by conjugation to Escherichia coli recipients as separate markers at low frequency. A non-self-transmissible plasmid conferring resistance to kanamycin, ampicillin and gentamicin was mobilized from Serratia species to E. coli, and became fully self-transmissible in subsequent matings.
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    Ascaris lumbricoides and allergic asthma. A new perspective
    (Health & Medical Publishing Group, 1979-10) Joubert, J. R.; De Klerk, H. C.; Malan, C.
    ENGLISH ABSTRACT: Infestation of humans with the parasite Ascaris lumbricoides may induce high total serium IgE levels, but the influence of this immunogenic respone on allergic asthma has not been defined. In this study, the specific antiparasitic IgE-mediated response as determined by skin-prick testing was related to the incidence of allergic asthma in Ascaris-infested patients. A limited number - 17% of the non-allergic controls and 51% of the allergic asthmatics - had a clinically detectable immunogenic response to the parasite. The predicted incidence of asthma was significantly higher than the observed incidence in the subjects in whom the Ascaris skin test was positive. This was not found in subjects in whom the Ascaris skin test was negative. Inhalation of Ascaris antigen induced asthmatic reactions in 7 of 8 patients who were Ascaris-positive on skin testing, but not in the negative controls. The groups of patients who repond immunogenically to parasite infestation need to be defined, as they may be predisposed to allergic diseases such as asthma.