[Comparative study on the protective effect of two immunization schemes using a hepatitis B recombinant vaccine in vulnerable health science students].

Objective: Demonstrate the protective effect of hepatitis B in vaccine vulnerable health sciences students, under 30 years with three schemes the vaccination, two of them are conventional three doses and another one with two doses.

Hypothesis: Three schedules of vaccination dosage schemes hepatitis B produce antibody response over 10 IU/ml.

Design: Analytical, experimental, longitudinal.

Antibiotic-resistant Salmonella typhi from two outbreaks: few ribotypes and IS200 types harbor Inc HI1 plasmids.

To investigate factors that could be involved in the emergence of antibiotic resistant S. typhi, we characterized R plasmids and antibiotic resistant S. typhi strains from two outbreaks of typhoid in Peru and Chile.

[The in vitro action of plants on Vibrio cholerae].

Natural products of several plants, according to the geographic location, are used by Peruvian people in the popular treatment of diarrhea, with good success. When cholerae cases appeared in Peru, we were interested to know the "in vitro" effect against Vibrio cholerae 01, of these useful plants to treat diarrhea. The following plants were tested: Cichorium intybus, Althaea officinalis, Psorela glandulosa, Geranium maculatum, Punica granatum, Malus sativa, Cydonia oblonga, Chenopodium ambrosoides, Krameria triandria, Tea chinensis, Daucus carota, Persea gratissima, Psidium guayaba and Lippia dulcis.

[Prevalence of lysotype No. 3 of Salmonella paratyphi A in Peru].

Sixty-nine S. paratyphi A strains isolated from Peru were studied with the aid of the phage-typing system of Banker. 55 strains (79.

Plasmid-mediated resistance to multiple antibiotics in Salmonella typhi.

Two hundred forty-one strains of Salmonella typhii isolated in Lima, Peru, from October 1981 through February 1983 were tested for susceptibility to antimicrobial agents. Seventy-two strains (29.9%) were resistant to chloramphenicol and other antibiotics, including ampicillin, sulfonamides, and trimethoprim.