The occurrence of seemingly abnormal numbers of microcephaly cases in newborns, detected since the second half of 2015, along with their association with the Zika virus, has led to the frenzied quest by physicians, researchers and health officials to understand what was happening.\u00a0 While they drew up lines of research, scientists from various specialties who had begun to analyze available data found themselves faced with yet another difficulty:\u00a0 there was no sufficient epidemiological information available to permit a comparison of the number of occurrences before and after microcephaly notification became mandatory.<\/p>\n
Without knowing the actual situation before the virus came into Brazil, it is difficult to know if the number of microcephaly cases is in fact increasing.\u00a0 And if so, how much of an increase has there been and what proportion of it is due to the virus?\u00a0 Without this information, there is room for speculation.\u00a0 Besides the lack of data on which to base comparisons, the criteria for defining microcephaly were changed in early December 2015, and some studies suggest that growth curves more suitable to the Brazilian population be used as parameters.\u00a0 This issue\u2019s cover story<\/a> seeks to provide information by compiling and analyzing all that is currently known about the subject.<\/p>\n * * *<\/p>\n A survey conducted by 575 botanists from Brazil and other countries has found that Brazil is the country with the world\u2019s greatest diversity of plants, algae and fungi, currently tallied at 46,097 species<\/a>.\u00a0 The study presents details of the second version of the List of Species of the Brazilian Flora published in December 2015 \u2013 the first was compiled in 2010. Additional lists will be published in the future because about 250 new species are described and published in scientific journals every year.\u00a0 The characteristics of the plants are beginning to be recorded in the Flora do Brasil Online database, expected to be completed by 2020 as part of World Flora Online, a repository of data on all of the world\u2019s known plant species.\u00a0 There is a tremendous amount of work yet to be done.\u00a0 For example, the state of Amazonas ranks third in diversity among the states, after Minas Gerais and Bahia.\u00a0 The explanation is simple: there were fewer collections there than in the other states researchers know better and visit more.<\/p>\n * * *<\/p>\n