Objective To understand the ecological developmental characteristics of rats in the epidemic areas of hemorrhagic fever with renal syndrome (HFRS) so as to provide a basis for effective control of HFRS.Methods Based on the China National Disease Surveillance Reporting and Management System,data of HFRS cases from 2010 to 2014 were collected and analyzed by retrospective analysis.Meanwhile surveillance data of rats were collected and the capture rates in different seasons,genders and districts were also analyzed.Results Totally 51,92,129,85 and 71 cases of HFRS were reported from 2010 to 2014.Most HFRS cases occurred from October to November which were 43,59,78,37 and 37,respectively.Totally 2902 rats were captured from 2010 to 2014.The five-year average capture rate was 4.87％ (2902/59610).The highest capture rate was 6.94％ (910/13107) in the third quarter and the outdoor capture rate (5.80％,1681/28987) was higher than that of indoor(3.99％,1221/30623,x2 =324.35,P ＜ 0.05).More male rats were captured than female rats and the overall proportion was 62.82％ (348/554) and 37.18％ (206/554),respectively.The outdoor rats were mainly Apodemus agrarius (556),Cricetulus triton (432),Rattus noruegicus (217),Mus musculus (211) and Sorex araneus (139),and the indoor rats were mainly Mus musculus (514),Rattus noruegicus (469) and Sorex araneus (181).The black rat disappeared and White-bellied rat appeared.Conclusions The rat density keeps higher all year round and the type of rats has become increasingly complex.Mixed living of indoor and outdoor rats increased the infection probability of different types of Hantavirus,which has an immediate impact on the spreading pattern of HFRS.

Objective To increase the ability to recognize the characteristic MRI features of multiple sclerosis (MS) in the spinal cord. Methods Fifteen patients with MS underwent MR examination of the cervical spine. The MS plaques were evaluated for lesion location, length,size on cross-section and lesion enhancement. MRI features of intraspinal tumor of spinal cord, cervical spondylopathy of myeloid form and transverse myelitis were analyzed and compared. Results The lesion mainly developed in cervical cord in the 15 patients. The lesions were less than five vertebra body in length. MRI features showed that involved cord segment was mild swollen with smooth periphery in sagittal section;the plaques showed iso-mild hypointense on T 1WI and hyperintense on T 2WI; the plaques were located peripherally and occupied less than 50%of the cross-sectional area of the cord; the lesions in active stage were enhanced by Gd-DTPA or no enhancement, the enhanced size of plaque was smaller than the extent showing hyperintense on T 2WI. The case of several onset showed various enhancement. Conclusion MS of spinal cord has characteristic feature on MRI, this can provide reliable proof for clinical diagnosis.

An improved and practical synthesis of racemic 11-demethylcalanolide A [(±)-1] was developed. This improved process involved Pechmann reaction on phloroglucinol with ethyl butyrylacetate to give 5, 7,-dihydroxy-4-n-propylcoumarin(3). Poly phosphoric acid (PPA) catalyzed acylation of compound(3) with crotonic acid, then intramolecular cyclization was achieved simultaneously in one step to afford the key intermediate chromanone(4). A microwave assisted synthetic method preparing chromene(6) using chromenynation of chromanone(4) with 1, 1-diethoxy-methyl-2-butene was conducted. Luche reduction of chromene(6) using NaBH<,4> with CeCl3·7H2O preferably gave (±)-1. The overall yield of this four step synthesis of (±)-1 was around 32% increasing one fold more than that of the previous method. An in vitro investigation showed that (±)-1 exhibited inhibitory activities against both wild-type and drug-resistant HIV-1 in HIV-1 RT and cell culture assay, and significant synergistic effects in combination with AZT, T-20, and indinavir. Its LD50 of acute toxicity in mice by intragastric administration and by intraperitoneal injection were 735.65mg·kg-1 and 525.10mg·kg-1, respectively. The C<,max> and AUC<,0-∞> were 0.54μg·mL-1 and 1.08(μg·mL-1)·h, respectively. The dynamics study of the inhibition of mice sera on HIV-1 RT showed that mice treated with 100mg·kg-1 (±)-1 once intraperitoneally were similar to that of 5mg·kg-1 of known clinical effective anti-HIV-1 drug neverapine. The results suggested that further investigation of the anti-HIV candidate (±)-1 was warranted.

Objective To investigate the influence of the variations of an epidemic focus on hemorrhagic fever with renal syndrome (HFRS) so as to provide a basis for effective control of HFRS.Methods HFRS epidemic data from the rapid development of urbanization of Huangdao District and the general development of Jiaonan City were collected and analyzed retrospectively from 1979 to 2014.And the HFRS cases,incidences,host animals and Hantavirus surveillances were compared.Results The three epidemic peaks occurred from 1979 to 2014 in Huangdao District and Jiaonan City,they were in the mid-1980s (1983-1987),the late 1990s (1995-1999) and around 2012 (2010-2014),and 954,80,37 and 2 506,614,432 cases were reported,respectively,in Huangdao District and Jiaonan City.The three peak years were 1986,1999 and 2012.And the annual incidences of Huangdao District were 385.73/100 000,15.64/100 000 and 2.51/100 000,respectively.The annual incidences of Jiaonan City were 67.07/100 000,28.68/100 000 and 14.68/100 000,respectively.The three peaks obviously appeared double peaks [the autumn and winter (from Oct.to Dec.) and the spring (from Jan.to Feb.)] in Jiaonan City.And the first peaks in Huangdao District was in the autumn and winter (from Oct.to Dec.) and the spring (from Jan.to Feb.),the second and the third were only in the autumn and winter (from Oct.to Dec.).Eight kinds of host animals were detected in Jiaonan City from 2005 to 2014.They were house mouse [27.53％ (1 108/4 024)],brown rat [25.50％ (1 026/ 4 024)],striped field mouse [14.84％ (597/4 024)],black rat [10.74％ (432/4 024)],hamsters [11.01％ (443/4 024)],shrew [8.72％ (351/4 024)],back grain hamster [1.02％ (41/4 024)] and club rat [0.65％ (26/4 024)].Two kinds of host animals were detected in Huangdao District.They were house mouse [57.14％ (16/28)] and brown rat [42.86％ (12/28)].The capture rates in Jiaonan City were higher than those of Huangdao District.The capture rate in 2012 was 8.04％ (855/10 638) and the capture rates in Huangdao District were all lower than 0.84％.The total detection rate in Jiaonan City was 2.81％ (113/4 024).And there was no positive detection for ten years in Huangdao District.Conclusions HFRS epidemic intensities have receded gradually in Huangdao District and Jiaonan City.The epidemic in Huangdao District obviously presents a low epidemic condition after the first peak.The few kinds and low densities of host animals are resulting in the sustainable condition.The evolution of epidemic patterns of HFRS is related to the change of epidemic sources by the differences in urbanization between the two places.