Monthly Archives: September 2017

“A Better Understanding of Climate Change”

Sorting out hype from reality.

Cryptosporidium Infection in Cattle, China

Gong C, Cao XF, Deng L, Li W, Huang XM, Lan JC, Xiao QC, Zhong ZJ, Feng F, Zhang Y, Wang WB, Guo P, Wu KJ, Peng GN. Epidemiology of Cryptosporidium infection in cattle in China: a review. Parasite. 2017;24:1. doi: 10.1051/parasite/2017001.

The present review discusses the findings of cryptosporidiosis research conducted in cattle in China and highlights the currently available information on Cryptosporidium epidemiology, genetic diversity, and distribution in China, which is critical to understanding the economic and public health importance of cryptosporidiosis transmission in cattle. To date, 10 Cryptosporidium species have been detected in cattle in China, with an overall infection rate of 11.9%. The highest rate of infection (19.5%) was observed in preweaned calves, followed by that in juveniles (10.69%), postweaned juveniles (9.0%), and adult cattle (4.94%). The dominant species were C. parvum in preweaned calves and C. andersoni in postweaned, juvenile, and adult cattle. Zoonotic Cryptosporidium species (C. parvum and C. hominis) were found in cattle, indicating the possibility of transmission between humans and cattle. Different cattle breeds had significant differences in the prevalence rate and species of Cryptosporidium. This review demonstrates an age-associated, breed-associated, and geographic-related occurrence of Cryptosporidium and provides references for further understanding of the epidemiological characteristics, and for preventing and controlling the disease.

California Cities Seek to Protect the Earth from Natural Processes

Climates change. In a rational world this case would not be considered credible. But this is California….Lawsuits without merit like this have been attempted before. Seems like these attorneys think EPA stands for the Earth Protection Agency…..doing all they can to protect the earth from natural processes.

 

 

“City attorneys in San Francisco and Oakland, California, sued five oil companies in two coordinated lawsuits on Tuesday, arguing that the courts should hold these companies responsible for climate change, and force them to financially compensate the cities for harm the plaintiffs claim those companies are causing to the planet’s environment.” click here

C. hominis, C. parvum dominant in China

Feng Y, Xiao L. Molecular Epidemiology of Cryptosporidiosis in China. Frontiers in microbiology. 2017 Sep 6;8:1701. doi: 10.3389/fmicb.2017.01701.

Molecular epidemiology of cryptosporidiosis is an active research area in China. The use of genotyping and subtyping tools in prevalence studies has led to the identification of unique characteristics of Cryptosporidium infections in humans and animals. Human cryptosporidiosis in China is exemplified by the high diversity of Cryptosporidium spp. at species and subtype levels, with dominant C. hominis and C. parvum subtypes being rarely detected in other countries. Similarly, preweaned dairy calves, lambs, and goat kids are mostly infected with non-pathogenic Cryptosporidium species (C. bovis in calves and C. xiaoi in lambs and goat kids), with C. parvum starting to appear in dairy calves as a consequence of concentrated animal feeding operations. The latter Cryptosporidium species is dominated by IId subtypes, with IIa subtypes largely absent from the country. Unlike elsewhere, rodents in China appear to be commonly infected with C. parvum IId subtypes, with identical subtypes being found in these animals, calves, other livestock, and humans. In addition to cattle, pigs and chickens appear to be significant contributors to Cryptosporidium contamination in drinking water sources, as reflected by the frequent detection of C. suis, C. baileyi, and C. meleagridis in water samples. Chinese scientists have also made significant contributions to the development of new molecular epidemiological tools for Cryptosporidium spp. and improvements in our understanding of the mechanism involved in the emergence of hyper-transmissible and virulent C. hominis and C. parvum subtypes. Despite this progress, coordinated research efforts should be made to address changes in Cryptosporidium transmission because of rapid economic development in China and to prevent the introduction and spread of virulent and zoonotic Cryptosporidium species and subtypes in farm animals.

Exposure to Disinfection Byproducts can occur via Vegetables

Coroneo V, Carraro V, Marras B, Marrucci A, Succa S, Meloni B, Pinna A, Angioni A, Sanna A, Schintu M. PRESENCE OF TRIHALOMETHANES IN READY-TO-EAT VEGETABLES DISINFECTED WITH CHLORINE. Food additives and contaminants. Part A, Chemistry, analysis, control, exposure and risk assessment. Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2017 Sep 21. doi: 10.1080/19440049.2017.1382723.

Trihalomethanes (THMs) – CHCl3, CHCl2Br, CHClBr2 and CHBr3 – are drinking water disinfection by-products (DBPs). These compounds can also be absorbed by different types of foods, including ready-to-eat (RTE) fresh vegetables. The potential absorption of THMs during washing of RTE vegetables could pose a potential risk to consumers’ health. The concentration of THMs in the water used in the manufacturing process of these products shall not exceed the limit of 100 or 80 µgL-1 according to European Union (EU) and United States legislation respectively. By contrast, there is little information about the presence of such compounds in the final product. This study evaluated the concentration of THMs in different types of RTE vegetables (carrots, iceberg lettuce, lettuce, mixed salad, parsley, parsley and garlic, rocket salad, valerian) after washing with chlorinated water. In the 115 samples analyzed, the average value of total THMs was equal to 76.7 ng g-1. Chloroform was the THM present in the largest percentage in all the RTE vegetables. These results show that the process of washing RTE vegetables should be optimized in order to reduce the risk for consumers associated with the presence of DBPs.

Mulitmedia Modeling of Children’s Lead Exposure

Zartarian V, Xue J, Tornero-Velez R, Brown J. Children’s Lead Exposure: A Multimedia Modeling Analysis to Guide Public Health Decision-Making. Environmental health perspectives 2017 Sep 12;125(9):097009. doi: 10.1289/EHP1605.

BACKGROUND: Drinking water and other sources for lead are the subject of public health concerns around the Flint, Michigan, drinking water and East Chicago, Indiana, lead in soil crises. In 2015, the U.S. Environmental Protection Agency (EPA)’s National Drinking Water Advisory Council (NDWAC) recommended establishment of a “health-based, household action level” for lead in drinking water based on children’s exposure.

OBJECTIVES: The primary objective was to develop a coupled exposure-dose modeling approach that can be used to determine what drinking water lead concentrations keep children’s blood lead levels (BLLs) below specified values, considering exposures from water, soil, dust, food, and air. Related objectives were to evaluate the coupled model estimates using real-world blood lead data, to quantify relative contributions by the various media, and to identify key model inputs.

METHODS: A modeling approach using the EPA’s Stochastic Human Exposure and Dose Simulation (SHEDS)-Multimedia and Integrated Exposure Uptake and Biokinetic (IEUBK) models was developed using available data. This analysis for the U.S. population of young children probabilistically simulated multimedia exposures and estimated relative contributions of media to BLLs across all population percentiles for several age groups.

RESULTS: Modeled BLLs compared well with nationally representative BLLs (0-23% relative error). Analyses revealed relative importance of soil and dust ingestion exposure pathways and associated Pb intake rates; water ingestion was also a main pathway, especially for infants.

CONCLUSIONS: This methodology advances scientific understanding of the relationship between lead concentrations in drinking water and BLLs in children. It can guide national health-based benchmarks for lead and related community public health decisions.

Climate Change Astrology

“Forty years ago, the front page of the Chicago Tribune featured astrologer Jeanne Dixon, and a warning that the West Antarctic Ice Sheet was going to collapse and drown us all. That was during the global cooling scare.” click here