Sin Nombre Virus Risk Assessment in Yosemite National Park

During August and September 2012, ten people who visited the park during the summer between June and mid-July confirmed HPS cases, three of whom were fatal (CDPH 2013 ). While living in symbolic lodge located in Curry Village's Boys Town district, nine of these people are believed to be exposed to SNV. The last victim is believed to have been exposed by hiking and camping at High Sierra Camp in the east 15 miles east of Curry Village. Due to recent incidents and serious threats related to HPS, we recommend preliminary public health risk assessment and continuous deer SNV epidemiological surveillance program.

Our first challenge is to identify the ecological state that leads to disease. For example, the occurrence of Hanta virus pulmonary syndrome (HPS) caused by Sin Nombre Hanta virus in the Southwest United States in 1993 may have been due to a series of ecological events leading to increased virus exposure ( Figure 2-2). In particular, dry season and rainy season increase ecosystem productivity, thereby increasing rodent food. Since rodent predators are decreasing by hunting, the amount of rodents can hardly be controlled, which leads to an increase in virus infections to deer populations and ultimately to humans.

Important environmental problems of the country and the role of national ecological observation network

Sin Nombre virus (SNV) is a pathogen of highly pathogenic New World virus and Hantavirus cardiopulmonary syndrome. We have shown previously that replication defective virus particles can induce a potent IFN stimulated gene (ISG) response in human primary cells. RNA viruses typically stimulate innate immune responses through interactions between viral nucleic acids, which are pathogen-associated molecular patterns, and cell pattern recognition receptors (PRR). Ligands that bind to PRR activate transcription factors that regulate the expression of antiviral genes and in all systems tested to date, IFN regulatory factor 3 (IRF3) serves as an essential intermediate for inducing ISG expression Have been described. However, we now describe a model that is not necessary to induce ISG transcription in response to IRF3 viral particles.