• Infection and Low Birth Weight in a Developing Country 

      Urrutia, Juan José; Mata, Leonardo; Trent, Frederick; Cruz, Jose; Villatoro, Elba; Alexander, Russell (Am J Dis Child. 1975;129(5):558-561, 1975)
      The causes of fetal growth retardation and premature delivery are not well defined. Although diet, smoking, maternal weight and height, and social class can be correlated with the size of the fetus, the relative contribution ...
    • Microflora of maize prepared as tortillas 

      Capparelli, Edward; Mata, Leonardo (1975-06)
      Very little is known of the microflora in tortillas, the major component in the diet of many Guatemalans and other Central Americans. Based in a Guatemalan highland Indian village, this study examined the types and amounts ...
    • Malnutrition-infection interactions in the tropics 

      Mata, Leonardo (1975-07)
      Mr. President Dr. Rozeboom, Officers and Members of the Society, ladies and gentlemen: I begin with a word of appreciation to Dr. Desowitz and Members of the Charles Franklin Craig Lectureship Committee for having invited ...
    • Breast-feeding, weaning and the diarrhoeal syndrome in a Guatemalan Indian village 

      Mata, Leonardo; Kronmal, Richard A.; García, Bertha; Butler, William; Urrutia, Juan José; Murillo-González, Sandra (Ciba Foundation Symposium 42 (new series) published July 1976 by Elsevier/Excerpta Medica/North-Holland. pp.311-338., 1976)
      Prospective studies in Mayan Indian children living in their natural setting were carried out from 1964 through 1974; observations began at birth and extended at least throughout the first three years of life. Adequate ...
    • The Environment of the Malnourished Child 

      Mata, Leonardo (1976)
      The study of the relation of man to his environment in developing countries emphasizes the inevitable need for societies to recognize the true causes of infection, malnutrition, and poverty. The need is for improvement ...
    • Antenatal events and postnatal growth and survival of children in a rural Guatemalan village 

      Mata, Leonardo; Kronmal, Richard A.; Urrutia, Juan José; García, Bertha (Annals of human biology, 1976, VOL. 3, NO. 4, 303-315, 1976-07-03)
      The biological features of all pregnant women and newborn infants in a typical rural village of Guatemala have been studied from 1964 to the present; 458 pregnancies have been analysed. The mothers averaged 143'1 em in ...
    • Program development for interventions in the nutrition-infection complex 

      Keusch, Gerald T.; Katz, Michael; Koster, Frederick T.; Mata, Leonardo; Rosenberg, Irwin H.; Solomons, Noel W. (National Academy of Sciences, noviembre 1978, 1978)
      The magnitude of malnutrition in the world is staggering. In addition to its major causative factors, which relate specifically to food availability at the household level, infectious diseases are an omnipresent and important ...
    • Escherichia Coli enterotoxigénica en niños hospitalziados en Costa Rica 

      Mata, Leonardo; Reyes, Liliana; Ramírez, Jorge A.; Evans, Doyle J. (Revista Médica Hospital Nacional de Niños Dr. Carlos Sáenz Herrera 13(1):23-32, 1978)
      Se estudió la prevalencia de Escherichia coli enterotoxigénica (ECET) productora de toxina labil y/ o estable en niños con y sin diarrea aguda, internados en el Hospital Nacional de Niños entre enero y diciembre de 1976. ...
    • Plasmidos de virulencia 

      Peñaranda, María Elena; Mata, Leonardo (Revista Médica del Hospital Nacional de Niños Dr. Carlos Sáenz Herrera 130(I): 11-22, 1978)
      Se revisan conceptos bisicos sobre los plasmidosdesoxirribonucleico extracromosomico con mplicacion autonoma— prisentee en el citoplasma bacte. riano. Se hace infasis en plismidos qua codifican factor's de virulencia como ...
    • Infección en la mujer embrazada y su influencia en el producto de la concepción 

      Mata, Leonardo; Urrutia, Juan José (Aspectos Perinatales del Parto Prematuro. Althabe, O. y R. Schwarcz (editores), El Ateneo, Buenos Aires, Argentina, pp. 199-213, 1978, 1978)
      La mujer embarazada está sujeta a una serie de cambios de tipo nutricional, bioquímico, metabólico y endocrinológico. Durante el embarazo, estos procesos pueden permanecer sin alteración o bien ser aumentados o suprimidos ...
    • Bacterias multirresistentes a los antibióticos aisladas de niños hospitalizados de "alto riesgo" 

      Peñaranda, María Elena; Brenes, Carmen; Vargas, Guillermo; Mata, Leonardo (Revista Médica del Hospital Nacioanl de Niños Dr. Carlos Sáenz, 1978)
      Between January and September, 1977, 43 strains of Klebslella-Enterobac-ter, 17 of Pseudomonas and 6 of Escherlchla coli —all resistant to several drugs—were isolated from 66 children hospitalized in the National Children's ...
    • Shigellosis 

      Mata, Leonardo; Urrutia, Juan José (Diseases of children in the Subtropics and Tropics. Jelliffe DB, Stanfield JP, ed. 3d edition. London, Edward Arnold, 1978. p. 492-498, 1978)
      Shigecllosis is an infectious disease caused by Shigellae, which are bacilli with capacity to invade the mucosa of the colon and less frequently the ileum. The disease occurs spora-dically and in epidemics with mild to ...
    • Algunos aspectos de la epidemología del cáncer gástrico en Costa Rica 

      Sierra Ramos, Rafaela; Gaínza Echeverría, Javier (Direccion General de Estadistica y Censo, 1978)
      A pesar del intenso esfuerzo que desde hace años se viene haciendo, la etiología del cáncer continua sin esclarecerse. De un total estimado de cincuenta millones de defunciones anuales en el mundo mas de cinco millones se ...
    • Anti-rotavirus antibody in human colostrum 

      Simhon Edgar, Alberto; Mata, Leonardo (The Lancet 311(8054), 7 January 1978, Pages 39–40. Originally published as Volume 1, Issue 8054, 1978)
      During investigation of the epidemiology of human rotavirus infection in Costa Rica, the anti-human rotavirus capacity of colostrum was studied. We were looking for an explanation for the relatively low incidence of acute ...
    • La etiología viral de las diarreas y la Microscopía Electrónica 

      Hernández Chavarría, Francisco; Mata, Leonardo (Rev. Méd. Hosp. Nal. Niños, 13 (1), 1978, 1978)
      Se revisan sucintamente los conceptos existentes sobre la etiología viral de las diarreas. Antes de 1973, estudios epidemiológicos señalaron la posible participaclon de virus en la causalidad de las diarreas. El desarrollo ...
    • Factor aglutinante de Rotavirus en calostro en mujeres costarricenses 

      Mata, Leonardo; Hernández Chavarría, Francisco (Rev. Méd. Hosp. Nal. Niño113(1): 45·52, 1978, 1978)
      Estudios prospectivos en una comunidad indígena de Guatemala demostraron la baja prevalencia de enfermedades infecciosas, especialmente de los tractos gastrointestinal y respiratorio, en niños alimentados exclusivamente al ...
    • Nutrition and health in societies in transition 

      Mata, Leonardo (In: Nutrition in Transition: Proceedings of the Western Hemisphere Nutrition Congress V, Quebec 1977, edited by Philip L. White and Nancy Selvey. (Chicago) American Medical Association, 1978, pp. 351-358, 1978-02-01)
      One often hears the expression that a country or society is "in transition," but there is not a clear definition of such, nor is there an effort to quantitate or characterize the level of transition undergone by a given ...
    • Comparison of sucrose with glucose in oral therapy of infant diarrhea 

      Mata, Leonardo; Vargas, William; Loría, Alba Rosa; Levine, Myron M.; Lizano, Cecilia; de Céspedes Montealegre, Carlos; Nalin, David R.; Simhon Edgar, Alberto (The Lancet, 312, 277-279, 1978-08)
      In a randomised double-blind trial, 51 5-10% dehydrated infants were rehydrated with oral electrolyte solutions containing sucrose or glucose. Most infants in both groups were successfuUy rehydrated, but the sucrose ...
    • Epidemiology of human rotavirus types 1 and 2 as studied by enzyme-linked immunosorbent assay 

      Yolken, Robert H.; Wyatt, Richard G.; Hisses, George; Brandt, Carld; Rodríguez, William J.; Wha Kim, Hyun; Parrot, Robert H.; Urrutia, Juan José; Mata, Leonardo; Greenberg, Harry B.; Kapikian, Albert Z.; Chanock, Robert M. (The New England Journal of Medicine 299:1156-1161, 1978-11-23)
      To determine the relative importance of two known serotypes of human rotavirus, we developed an enzyme-linked immunosorbent assay to differentiate serotype-specific rotavirus antigen and antibody. Using this technic, we ...