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The study presented here aimed to elucidate the diagnostic value of bacterial stool cultures and viral antigen tests when performed based on the clinical characteristics of acute gastroenteritis in infants and young children. A total of 21 (11.2%) bacterial and 74 (39.6%) viral infections affecting 187 children under the age of 3 years was investigated. Blood (p<0.001) and mucus (p=0.014) in the stool and a C-reactive protein (CRP) level of >or=50 mg/l (p=0.006) were more significantly associated with gastroenteritis of bacterial rather than viral origin. Vomiting (p<0.001) was significantly associated with viral gastroenteritis. Among children with bloody stool, culture grew a Salmonella spp. in 35% and for vomiting children, stool antigen tests detected rotavirus in 60% of cases. In conclusion, etiologic tests to determine the cause of childhood gastroenteritis according to their characteristic clinical features or laboratory test results, or both, are of low diagnostic value.

Clustered regularly interspaced short palindromic repeats (CRISPR) are composed of numerous repeat-spacer units and are considered a prokaryotic defence system against foreign nucleic acids. Since antibiotic-resistant genes are frequently encoded in foreign nucleic acids, the aim of this study was to test whether erythromycin susceptibility in group A streptococcus (Streptococcus pyogenes) is associated with characteristics of CRISPR elements. Erythromycin susceptibility of 330 isolates collected between 1997 and 2003 was analysed. Among 29 emm types, emm12, emm75 and emm92 showed significant changes in erythromycin-resistance rates. By sequencing the spacers from two CRISPR loci, spacer contents in emm12, emm75 and emm92 strains were associated with erythromycin susceptibility. Strains with fewer spacers were more resistant to erythromycin. Moreover, in emm4 strains, which showed no significant change in their annual erythromycin-resistance rate, CRISPR type and number of spacers were not correlated with erythromycin susceptibility. These results highlight a novel association between CRISPR spacer content and erythromycin susceptibility in group A streptococcus.

Rice is produced in more than 95 countries worldwide and is a staple food for over half of the world's population. Rice is also a major food crop of Taiwan. There are numerous rice crops planted on the western plains of Taiwan, and, after the harvest season, the left-over straw is often burned on-site. The air pollutants from the burning emissions include CO₂, CO, CH₄ and other suspended particles, most of these being the greenhouse gases which cause global climate change. In this study FORMOSAT-2 satellite images and ground-truth data from 2008 and 2009 are used to conduct supervised classification and calculate the extent of the straw burning areas. It was found that 10% of the paddies in the study area were burned after harvest during this 2-yr period. On this pro rata basis, we calculated the overall carbon emissions from the burning of the straw. The findings showed that these few farmers produced up to 34 000 tons of carbon emissions in 2008, and 40 000 tons in 2009. The study results indicate that remotely sensed images can be used to efficiently evaluate the important characteristics for carbon emission detection. It also provides quantitative results that are relevant to tracking sources of transport pollution, postharvest burning, and Asian dust in Taiwan

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