Evidence on delay in sexual initiation, multiple partnerships and condom use among young people: review of Caribbean HIV behavioural studies.

OBJECTIVE: To develop a Caribbean regional profile of youth sexual behaviour associated with risk of HIV. DESIGN AND METHODS: A review of sexual behaviour surveys with youth aged 15-24 years was conducted as part of the Pan American Health Organization (PAHO) HIV Caribbean Office's Review and Gender Analysis of Caribbean HIV Behavioural and Seroprevalence Studies. Studies with internationally recommended indicators were prioritized. Studies were sought via database searches and contact with researchers and National AIDS Programmes. RESULTS: Inter-country comparisons and longitudinal analyses were limited by lack of uniformity in study age groups and indicators. Data were sufficient to identify the following among 15-24-year olds: .More males than females report sexual intercourse before the age of 15 years. .More than half of sexually active youth report sex before age 16 years. .First sexual encounter is usually with someone older, with age differences larger for females. .More males than females report multiple partnerships, with 20%-76% of males reporting this in the past year. .Condom use varies widely, with no clear pattern by gender. CONCLUSION: There are substantial levels of early sexual initiation, intergenerational sex among females and multiple partnerships among males, while condom use is inconsistent. Efforts to promote delay in sexual initiation, partner reduction and consistent condom use should be supplemented with initiatives against harmful gender norms, child abuse and transactional sex and skills to negotiate safe sex. Standardization of survey methods to facilitate cross-study comparisons should continue and encompass additional risk factors such as transactional sex, gender-based violence, drug use and HIV treatment adherence.

Evidence on delay in sexual initiation, multiple partnerships and condom use among young people: review of Caribbean HIV behavioural studies / Evidencias sobre la demora en la iniciación sexual, las parejas múltiples, y el uso del condón entre los jóvenes: revisión de estudios de conducta en relación con el VIH en el Caribe

OBJECTIVE: To develop a Caribbean regional profile of youth sexual behaviour associated with risk of HIV. DESIGN AND METHODS: A review of sexual behaviour surveys with youth aged 15-24 years was conducted as part of the Pan American Health Organization (PAHO) HIV Caribbean Office's Review and Gender Analysis of Caribbean HIV Behavioural and Seroprevalence Studies. Studies with internationally recommended indicators were prioritized. Studies were sought via database searches and contact with researchers and National AIDS Programmes. RESULTS: Inter-country comparisons and longitudinal analyses were limited by lack of uniformity in study age groups and indicators. Data were sufficient to identify the following among 15-24-year olds: * More males than females report sexual intercourse before the age of 15 years. * More than half of sexually active youth report sex before age 16 years. * First sexual encounter is usually with someone older, with age differences larger for females. * More males than females report multiple partnerships, with 20%-76% of males reporting this in the past year. * Condom use varies widely, with no clear pattern by gender. CONCLUSION: There are substantial levels of early sexual initiation, intergenerational sex among females and multiple partnerships among males, while condom use is inconsistent. Efforts to promote delay in sexual initiation, partner reduction and consistent condom use should be supplemented with initiatives against harmful gender norms, child abuse and transactional sex and skills to negotiate safe sex. Standardization of survey methods to facilitate cross-study comparisons should continue and encompass additional risk factors such as transactional sex, gender-based violence, drug use and HIV treatment adherence.

OBJETIVO: Desarrollar un perfil regional caribeño del comportamiento sexual de la juventud en relación con el riesgo de VIH. DISEÑO Y MÉTODOS: Se realizó una revisión de los estudios del comportamiento sexual de jóvenes entre 15 y 24 años, como parte del Estudio de la Oficina de VIH de la Organización Panamericana de la Salud (OPS) para el Caribe, y el Análisis de Género de los Estudios de Seroprevalencia y Conducta en relación con el VIH en el Caribe. Se le dio prioridad a los estudios con indicadores recomendados internacionalmente. Se obtuvieron estudios mediante búsquedas de bases de datos y contactos con los investigadores y los programas nacionales de SIDA. RESULTADOS: Los análisis longitudinales y las comparaciones entre países estuvieron limitados por la falta de uniformidad en los grupos etarios y los indicadores de los estudios. Los datos fueron suficientes para identificar lo siguiente entre los jóvenes de 15 a 24 años de edad: * Más varones que hembras reportaron relaciones sexuales antes de los 15 años de edad. * Más de la mitad de los jóvenes sexualmente activos reportaron relaciones sexuales antes de los 16 años. * El primer encuentro sexual suele ser con alguien de más edad, siendo las diferencias de edad mayores para las mujeres. * Más varones que hembras reportaron relaciones de parejas múltiples; 20%-76% de los hombres reportaron este tipo de relación en el último año. * El uso del condón varía ampliamente, sin un patrón claro por género. CONCLUSIÓN: Hay niveles considerables de iniciación sexual temprana, sexo intergeneracional entre las hembras, y múltiples parejas entre los varones, mientras que el uso del preservativo es inconsistente. Los esfuerzos por promover la demora en la iniciación sexual, la reducción de parejas, y el uso sistemático del condón deberían complementarse con las iniciativas contra las normas de género perjudiciales, el abuso infantil, el sexo transaccional, y las habilidades para negociar sexo seguro. La estandarización de los métodos de encuesta para facilitar las comparaciones transversales debe continuar y abarcar otros factores de riesgo, tales como el sexo transaccional, la violencia de género, el uso de drogas, y el cumplimiento con el tratamiento del VIH.

20th-Century doubling in dust archived in an Antarctic Peninsula ice core parallels climate change and desertification in South America.

Crustal dust in the atmosphere impacts Earth's radiative forcing directly by modifying the radiation budget and affecting cloud nucleation and optical properties, and indirectly through ocean fertilization, which alters carbon sequestration. Increased dust in the atmosphere has been linked to decreased global air temperature in past ice core studies of glacial to interglacial transitions. We present a continuous ice core record of aluminum deposition during recent centuries in the northern Antarctic Peninsula, the most rapidly warming region of the Southern Hemisphere; such a record has not been reported previously. This record shows that aluminosilicate dust deposition more than doubled during the 20th century, coincident with the approximately 1 degrees C Southern Hemisphere warming: a pattern in parallel with increasing air temperatures, decreasing relative humidity, and widespread desertification in Patagonia and northern Argentina. These results have far-reaching implications for understanding the forces driving dust generation and impacts of changing dust levels on climate both in the recent past and future.

Evidence of differences in the biotransformation of organic contaminants in three species of freshwater invertebrates.

Acute static bioassays were performed using three freshwater invertebrate species (the oligochaete Lumbriculus variegatus, the fingernail clam Sphaerium corneum and the larvae Chironomus riparius) exposed separately to a variety of 14C radiolabelled contaminants. The aim of this work was to investigate if the chemicals remained as parent compounds after the treatments. Chemicals used were 2,4-dichlorophenol; 2,4,5-trichlorophenol; pentachlorophenol; pyrene; Fenpropidin, and Trifluralin. Homogenates of the whole body tissue of each organism were prepared and total radioactivity was measured. Contaminants were then extracted into organic solvents and analysed by high-pressure liquid chromatography techniques. Chromatograms showed that most of the substances extracted were present as parent compounds in S. corneum and in L. variegatus. In contrast, for C. riparius a low proportion of the chemicals was recovered as parent compounds. These results suggest that different metabolic processes could take place in the different species.

Hydroxamic acid glucosides in honeydew of aphids feeding on wheat.

DIMBOA glucoside (2-O-/gb-D-glucopyranosyl-4-hydroxy-7-meth-oxy-1,4-benzoxazin-3-one), the main hydroxamic acid (Hx) in intact wheat plants, was detected in the honey dew ofRhopalosiphum padi feeding on seedlings of six wheat cultivars that differed in their concentration of Hx, suggesting that the chemical circulates in the phloem. Neither the aglucone (DIMBOA) nor its main breakdown product were found in any of the honeydew samples. Honey dew production by aphids caged on seedlings of the wheat cultivars and DIMBOA glucoside concentrations in the honeydew followed biphasic curves when plotted against Hx concentration, suggesting passive ingestion of the chemical from the phloem at low Hx concentrations and limited ingestion due to feeding deterrency by Hx in mesophyll cells at high Hx concentrations. The presence of plant toxins such as Hx glucosides in the phloem sap, the main ingesta of aphids, and in the mesophyll cells, has major implications for plant defense, through a feeding deterrent effect during stylet penetration, and deterrency (antixenosis) along with antibiosis during feeding.

The laboratory diagnosis of leptospirosis in PUO cases in Jamaica - abstract

A study was done over a two-year period 1967 and 1968 on 171 patients attending the clinics at one of the sugar estates in Jamaica. These patients were clinically diagnosed as cases of pyrexia of unknown origin (PUO) with temperatures ranging in the regions of 99.4-103 degree F. The incidence of some of these PUO cases in the year 1968 was probably due to outbreaks of (1) Influenza (Hong Kong - Asian) (2) dengue. Of the total amount tested serlogically, 103 cases were reactive (60.2 percent), while 68 where non-reactive to leptospiral antibodies (39.8 percent), with ages ranging from 6-69 years. A total of 83 cases were reactive among the males (59.7 percent) while 56 (40.3 percent) were negative. Reactive cases among females amounted to 20 (62.5 percent) with 12 (37.5 percent) negative. Reactivity of sera tested serologically in relation to occupation among the males included persons working in the factories, field, wharf and in the laboratory. In the field-worker category a total of 55 persons showed antibodies to leptospirosis (79.7 percent). Reactivity of sera related to females with titres of 1:100 and above showed a total of 20 (64.5 percent) and these included school-girls housewives and office maids. All sera were tested serologically by: a. Macroscopic agglutination Test using a battery of six formalinized antigens, L. icterohaemorrhagiae, L. jules, L. canicola, L. pomonam, L. Abramis and L. patoc. b. Microscopic Agglutination Test employing six antigens (live) as indicated in the macroscopic test. c. Complement fixation Test - using a battery of 8 CFT killed antigens. The highest distribution of serotypes was found in L. icterohaemorrhagiae 75.2 percent, L.jules 31.2 percent. The highest seasonal distribution of reactive cases was in the months of October and December during the two-year period (AU)

Recent investigations of leptospirosis in Jamaica

The epidemiologic, clinical and laboratory features in Jamaica of a series of 50 cases of leptospirosis collected at the diagnostic laboratory of the Department of Microbiology - U.W.I. are reviewed. Infections occurred in most of the parishes of the island and were associated with a wide range of occupations. Forty-six (46) of these patients were hospitalized at the University Hospital W.I. and a total of 9 isolates were made. Three of the patients (all with positive cultures) were from the Monymusk Sugar Estates and one was hospitalized elsewhere. The serotypes identified from these isolates were Icterohaemorrhagiae, Jules, Kremastos and Abramis. The age distribution ranged from 10 to 70 years of age: there were 35 males and 15 females. Each serotype seemed capable of producing a wide variety of clinical features. The serotypes most commonly diagnosed in the laboratory by the microscopic and macroscopic tests were Leptospira Icterohaemorrhagiae, Canicola, Jules Pomona and Abramis. The highest titre observed wa 1:3200 in the serotype L. Icterohaemorrhagiae. Experience gained and continued work in the field of Leptospirosis over the past few years indicate that the Leptospires are a more common infection of man and animal that was formerly realized(AU)