Resumen La Salvia hispanica L. (chía) es una planta herbácea originaria de México, pertenece a la familia Lamiaceae. El cultivo fue prohibido y sustituido por otros cereales durante la conquista. Por el contenido nutricional y propiedades nutraceúticas que posee, se ha reintroducido y actualmente se considera un alimento potencial altamente nutritivo. La superficie sembrada se incremente anualmente, los materiales cultivados son genotipos locales o introducidos, debido que son escasas las variedades mejoradas. Con el objetivo de identificar accesiones sobresalientes, orientadas a una mayor eficiencia del cultivo, durante el ciclo agrícola primavera-verano 2017, se caracterizaron agronómicamente 32 accesiones de S. hispanica, en siete ambientes, bajo un diseño de bloques completos al azar con tres repeticiones. Se evaluaron las variables: altura de planta, diámetro de tallo, peso de planta, número de espigas, peso de grano por planta y rendimiento por hectárea. Las accesiones 1, 2, 12 y 22 presentaron mayor rendimiento de semilla por hectárea, altura de planta, número de espigas florales, frutos por espiga y peso seco de planta. El promedio de producción de semilla fue de 924 kg ha-1. El mejor ambiente para producción de chía fue Rancho San Lorenzo, Metepec. El análisis clúster agrupo a las accesiones en cinco conglomerados, agrupándolos por su rendimiento y variables afines.

Abstract Salvia hispanica L. (chia) is an herbaceous plant native to Mexico, belongs to the Lamiaceae family. The crop was banned and replaced by other cereals during the Conquest. Due to the nutritional content and nutraceutical properties it possesses, it has been reintroduced and is currently considered a highly nutritious potential food. The area sown is increased annually, the cultivated materials are usually local or introduced genotypes, because there are few improved varieties. With the aim of identifying outstanding accessions, oriented to greater efficiency of the crop, during the 2017 spring-summer agricultural cycle, 32 accessions of S. hispanica were agronomically characterized, in seven environments, under a design of randomized complete blocks with three repetitions. The following variables were evaluated: plant height, stem diameter, plant weight, number of spikes, grain weight per plant and yield per hectare. Accessions 1, 2, 12 and 22 had higher seed yield per ha, plant height, number of flower spikes, fruits per spike and dry plant weight. The average seed production was 924 kg ha-1. The best environment for chia production was Rancho San Lorenzo, Metepec. The cluster analysis grouped the accessions into five clusters, grouping them by their yield and related variables.

Uma epidemia de Dengue hemorrágica ocorreu em Cuba no ano de 1981. Entre a população de cerca de 10 milhões de habitantes, registraram-se 344.203 casos, sendo 71,3% em adultos e o restante crianças, entre as quais a doença se apresentou com maior gravidade. Durante o pico da epidemia, foram notificados 11.271 casos em um único dia. Neste trabalho se expõem os aspectos organizativos do atendimento médico durante a epidemia e o estudo realizado em 2239 pacientes hospitalizados com diagnóstico confirmado de Dengue hemorrágica, em três hospitais da Cidade de Havana, no período junho - agosto de 1981. Apresentam-se as principais manifestações clínicas e humorais de uma amostra de 2239 pacientes menores de 15 anos de idade. Discute-se ainda alguns aspectos terapêuticos, inclusive a experiência do autor com o uso de interferon em 166 pacientes.

An outbreak of hemorrhagic dengue fever occurred in Cuba in 1981. Among a population of about 10 million people, 344.203 persons were affected; 71,3% of these were adults and the remaining were children. Among the latter the disease was more severe. During the peak of the epidemic up to 11. 701 cases were reported in one single day. In this article the organizational aspects of health care delivery durint the epidemics as well as the studies performed in the 2239 patients admited to 3 hospitals of the city of La Habana from June to August 1981 are reported. The most important clinical and laboratory data from sample of 2239 patients under 15 years of age are presented. Some therapeutic aspects, including the experience of the author with the use of in tereferon in 166 patients, are also discussed.

Uma epidemia de Dengue hemorrágica ocorreu em Cuba no ano de 1981. Entre a população de cerca de 10 milhões de habitantes, registraram-se 344.203 casos, sendo 71,3% em adultos e o restante crianças, entre as quais a doença se apresentou com maior gravidade. Durante o pico da epidemia, foram notificados 11.271 casos em um único dia. Neste trabalho se expõem os aspectos organizativos do atendimento médico durante a epidemia e o estudo realizado em 2239 pacientes hospitalizados com diagnóstico confirmado de Dengue hemorrágica, em três hospitais da Cidade de Havana, no período junho - agosto de 1981. Apresentam-se as principais manifestações clínicas e humorais de uma amostra de 2239 pacientes menores de 15 anos de idade. Discute-se ainda alguns aspectos terapêuticos, inclusive a experiência do autor com o uso de interferon em 166 pacientes.

An outbreak of hemorrhagic dengue fever occurred in Cuba in 1981. Among a population of about 10 million people, 344.203 persons were affected; 71,3% of these were adults and the remaining were children. Among the latter the disease was more severe. During the peak of the epidemic up to 11. 701 cases were reported in one single day. In this article the organizational aspects of health care delivery durint the epidemics as well as the studies performed in the 2239 patients admited to 3 hospitals of the city of La Habana from June to August 1981 are reported. The most important clinical and laboratory data from sample of 2239 patients under 15 years of age are presented. Some therapeutic aspects, including the experience of the author with the use of in tereferon in 166 patients, are also discussed.