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Biomedical subjects

C A Canosa

Publications and source records attributed to C A Canosa.

12 recordsLinked to original sources
PubMed1997

Anonymous testing of newborn infants for HIV antibodies as a basis for estimating prevalence of HIV in childbearing women: the 1991-1994 study in Spain.

During 1991-1994, anonymous screening of newborn infants for maternal antibody to human immunodeficiency virus (HIV) was carried out in three regions of Spain: Valencia, Galicia and Sevilla. The newborn infants whose heel-stick blood eluates were satisfactory for HIV antibody tests were a consecutive series of 104 876, representing 99.3% of all newborn infants undergoing routine metabolic screening and estimated as comprising at least 98% of all births in the three regions. Enzyme immunoassay (EIA) positives were confirmed by immunoblot, yielding 246 confirmations: a rate of 2.3 per 1000. Seropositivity rates ranged from 1.4 per 1000 in Galicia to 2.1 in Sevilla and 3.1 in Valencia, and remained relatively stable in each region during the years of the study. Within socioeconomically defined subgroups of birth hospitals in Valencia and Galicia, all subgroups contained seropositives, even though there was a twofold to fivefold over-representation in the "inner city" public hospitals. To estimate the proportion of HIV-1-seropositive newborn infants who were positive for HIV-1 DNA, polymerase chain reaction (PCR) assays were performed on 165 dried blood spots that had been retained following positive immunoblot assays. Fifteen (9%) were PCR positive, and when this proportion is adjusted for the age-specific sensitivity of the method, it translates into an estimated HIV-1 transmission rate of 24% (range 18-36%). For 94,906 of the 104,876 newborn infants screened, the EIA used could detect antibodies that react with epitopes of HIV-1 and HIV-2. There were 30 newborn infants whose blood eluate was positive by this combined HIV-1/HIV-2 antibody screen and whose secondary screening with monovalent HIV-2 and HIV-1 EIA indicated that the HIV-2 reactivity was above the cut-off whereas the HIV-1 was not. Ranking these 30 results according to absolute HIV-2 reactivity and relative reactivity with respect to HIV-1 indicated that four infants were probable true HIV-2 seropositives and a total of 12 were possible HIV-2 seropositives, a prevalence of the order of 1:10000 to 1:20000 newborn infants. These anonymous population-based serological studies provide "leading-indicator" data to complement traditional AIDS surveillance for epidemiological and planning purposes.

AIDS Serodiagnosis↗
PubMed1994

Epidemiology of HIV infection in children in Europe.

In Europe the Human Immunodeficiency Virus (HIV) epidemic in children is an important public health problem. Reliable epidemiological information varies widely among countries, and there is no standard method to document the pandemia. By September 1992, a total of 81,849 AIDS cases were identified. France had 21,487, Spain 15,678 and Italy 14,784 (63% of all cases). The highest rate per 100,000 inhabitants occurred in Spain (88.9), France had 70.6 and Italy 63.5. The numbers of HIV+ newborns (NB) in Spain were 4673, in Italy 2,693, in Belgium 368, in Scotland 79 and in Holland 11. The highest rate of HIV+ NBs per 100,000 inhabitants occurred in Spain (120.1), the lowest in Holland (0.73). In Western Europe, 82% of all cases were due to vertical transmission. Mothers' venous drug use was the most common form of HIV transmission.

Acquired Immunodeficiency Syndrome↗
PubMed1991

[Spanish Pediatric Association. Madrid. Human immunodeficiency virus infection. Spanish multicenter study].

The results of an epidemiological survey in Spain organized by the "Spanish Pediatric Association" of children born to HIV+ mothers from 1981-1989 are presented. The objectives were, a) to document in the different parts of Spain the number of HIV+ children born to HIV+ mothers, and b) to identify the risk factors involved in the HIV infection. Only in public hospitals, a total of 1938 HIV+ children born to HIV+ mothers were identified. A systematic yearly increase of HIV+ newborns was evident since 1985. Madrid, Catalonia, Valencia, Basq and Andalucia communities incorporated 85% of all cases. 93% of mothers were IVDU and 51% of them were married. Prematurity occurred in 27% of cases and low birth weight in 33% of NB's. The rate of transmission in children over 18 months of age was 25.6% Breast feeding could be a risk factor in the transmission of HIV infection observed in children over 18 months of age. No other maternal risk factors responsible for the HIV transmission were identified. 12% of children died with AIDS. Clinical classification and evolution of HIV infection did not significantly differ from similar studies in other parts of the world. In spite of only public hospitals being involved, Spain has more identified HIV+ children than Italy, Switzerland, Federal Republic of Germany, United Kingdom, Sweden and Belgium combined. The pediatric centres with large number of cases require interdisciplinary pediatric specialized units to cope with the increase demand of medical services, now inadequate and insufficient. To fight drug use and HIV infection in Spain, health education and family support, are indispensable in trying to arrest the continuous spread the HIV infection.

Acquired Immunodeficiency Syndrome↗
PubMed1977

Acute infectious hepatitis. Clinical and epidemiological study.

A retrospective study of 120 children from birth to seven years of age suffering from acute infectious hepatitis was carried out from 1971 to 1974 at the Children's Hospital "La Fe". Only the most serious cases from the region were admitted to the Hospital and were classified and analyzed according to HBAg+ and HBAg- groups. Clinical and biochemical evaluations were done at admission, and again after 15 and 30 days. The main findings were as follows: hospital incidence was 5%; seasonal distribution did not follow the expected epidemiological pattern; the disease was more common among malnourished children; HBAg+ and HBAg- cases were not randomly distributed among the various blood groups: A+ children were four times more susceptible to HBAg- than to HBAg+, and 0+ children were more than twice more susceptible to HBAg+ than to HBAg-; clinical and biochemical recovery occurred within 30 days after hospital admission; mortality was 2.5%. Steroid therapy was reserved for the most serious cases; however, it was not possible to evaluate in this study its contribution to the course of the disease.

Acute Disease↗
PubMed1977

[Sociocultural factors and nutrition (author's transl)].

A schematic review of some of the most significant sociocultural factors related to food intake throught life, either in developing or developed societies is presented. In both societies, sociocultural factors are of fundamental importance on the determination of feeding practices, thus its excess or deficit are of great relevance to physical growth, possibly mental development as well as on morbidty and mortality. In developing societies low social class and poor education are sinonimous of poor nutrition. However, if the whole population in developed societies are studied, it is proven once again that nutritional deficiencies do also exist among marginal groups of people, which are mainly produced by poor education, erroneous feeding practices, nutritional taboos during health and disease, byas and prejudices. It must follows that in these societies, relative large group of children are poorly fed during the critical periods of growth and development due to sociocultural factors. Only through the appropiate and enforced nutrition educational programs at all learning levels, primarw and higher education, as well as better and more complete nutritional curriculum at Medical and Public Health Schools could perhaps solve, the problem, or at least significant alleviated it. This is the hope.

Cultural Characteristics↗
PubMed1968

Microelectrode studies of dog's gastric mucosa.

In anesthetized dogs, the potentials in the mucous coat and gastic cells were measured with microelectrodes. In the secreting stomach, with isotonic saline in contact with the mucosal surface, the orientation of the initial change in potential difference (PD) was often the same as that of the liquid junction potential between gastric juice and saline (the microelectrode became negative to a reference electrode in the saline) but the magnitude of the change was never more than 11 mv. On the basis of this finding an explanation is offered for the observation that in the secreting stomach replacing isotonic saline with isotonic HCl as the bathing fluid on the mucosal surface, results in a change in the serosal to mucosal PD of only 19 mv, which is 40% less than the liquid junction potential between gastric juice and saline. In the surface epithelial cells of both resting and secreting stomach, multiple levels of potentials were found. For the secreting stomach, the resistance between the interstitial fluid of the pit region and the fluid on the mucosal surface was 55 ohm cm(2), determined as the change in PD per unit of applied current across stomach. The implications of these findings are discussed with reference to the separate site theory of HCl formation.

Animals↗