A 3-month-old neonatal rhesus macaque HFMD model caused by coxsackievirus B1 infection and viral tissue tropism.

Coxsackievirus B1 (CVB1), an enterovirus with multiple clinical presentations, has been associated with potential long-term consequences, including hand, foot, and mouth disease (HFMD), in some patients. However, the related animal models, transmission dynamics, and long-term tissue tropism of CVB1 have not been systematically characterized. In this study, we established a model of CVB1 respiratory infection in rhesus macaques and evaluated the clinical symptoms, viral load, and immune levels during the acute phase (0-14 days) and long-term recovery phase (15-30 days). We also investigated the distribution, viral clearance, and pathology during the long-term recovery period using 35 postmortem rhesus macaque tissue samples collected at 30 days postinfection (d.p.i.). The results showed that the infected rhesus macaques were susceptible to CVB1 and exhibited HFMD symptoms, viral clearance, altered cytokine levels, and the presence of neutralizing antibodies. Autopsy revealed positive viral loads in the heart, spleen, pancreas, soft palate, and olfactory bulb tissues. HE staining demonstrated pathological damage to the liver, spleen, lung, soft palate, and tracheal epithelium. At 30 d.p.i., viral antigens were detected in visceral, immune, respiratory, and muscle tissues but not in intestinal or neural tissues. Brain tissue examination revealed viral meningitis-like changes, and CVB1 antigen expression was detected in occipital, pontine, cerebellar, and spinal cord tissues at 30 d.p.i. This study provides the first insights into CVB1 pathogenesis in a nonhuman primate model of HFMD and confirms that CVB1 exhibits tissue tropism following long-term infection.

Research on distribution of gastrointestinal peptide glucagon-1 of positive cells in tree shrews / 局解手术学杂志

Objective To observe tree shrews gastrointestinal glucagon like peptide 1 ( glp-1 ) immune response positive cells ( EG cells) distribution and the difference of the digestive tract of rats.Methods Immunohisto chemical SABC method to detect tree shrews diges-tive tract (except for oral cavity, pharynx) glp-1 cells positive content.Results EG cells distributed in tree shrews duodenum,ileum and colon,glandular epithelial cells of jejunum,positive material is distributed in the cytoplasm.Tree shrews stomach,rectum did not see EG cell distribution.Ileal immune dyeing results show positive,EG cells of the digestive tract,only the ileum and colon distribution glp-1 more posi-tive, tree shrews compared with the rats in the digestive tract glp-1 significant difference (P<0.01).Conclusion Gastrointestinal tree shrew in duodenum,ileum and colon,jejunum have glucagon positive cells.The rat only have positive cells in the ileum and colon.According to the mechanism of the glp-1 and the distribution of tree shrews gastrointestinal glp-1,tree shrews atherosclerosis ( atherosclerosis,AS) AS the model is not easy to make may be associated with the role of glp-1.

Observation and analysis of the individual behavior with weaning of infant Rhesus Monkeys / 中国比较医学杂志

Objective To understand the characteristics and rules of behavior and preliminary study on the change of psychological state and behavior of infant rhesus monkeys after weaning by artificial feed .Methods 290 infant rhesus monkeys were born in 2012, individual behavior of infant rhesus monkeys were observed and recorded by the methods of ad libitum sampling and chronography .Results The behavior of huddling , sucking finger and sucking body of companion were observed in the first month , the behavior of huddling and sucking finger were significantly increased in the second and third month(P <0.05), sucking body of companion in second month were significantly higher than the first month (P <0.05);the new behavior pacing , sucking genitalia and mounting were observed in the second month , pacing and sucking were significantly increased in the third month ( P <0.05 ) , mounting did not have obvious change; in the third month , sucking toe behavior ware recorded and did not change with time; The proportion of huddling behavior occurred between female and female was significantly higher than opposite sex or male in the same cage .The male infant monkeys were more likely to occurred pacing behavior than female .Sucking body of companion and sucking finger behavior of male were significantly lower than the female infant monkeys ( P <0.05 ) .There was no significant difference of sucking toe behavior .Conclusions 7 behaviors were recorded during the whole stage of observation , huddling behavior , pacing behavior , sucking toe behavior , sucking finger behavior , sucking genitalia behavior , sucking body of companion behavior and mounting behavior respectively , and 7 behaviors were increased by degrees with time .Huddling behavior to reflect fear psychology;sucking behavior to represent physiological demand and defensive psychology ;pacing was insignificant behavior in the initial stage , then to reflect psychological anxiety of rhesus monkeys .Provided a way and model on assessment of psychology, praxiology, to study and research the change of psychological state and behavior of early weaning infants .

Improvement for New Blinking Emergency Location Transmitter / 医疗卫生装备

Objective To develop a more reliable blinking emergency location transmitter with longer time for aircrew in distress. Methods The new LED and new type of explosion-proof casing material (Polycarbonate) with new technologies are adopted. Results Environmental tests and performance tests were done on the new emergency location transmitter according to the environmental requirements of aeronautic products. Conclusion The new emergency location transmitter can meet the operation requirements for aircrew in distress.

Current situation and prospects of aircrew survival equipment / 医疗卫生装备

Aircrew survival equipment is for pilots' survival when they have to parachute or land in various bad situations. Introduction relating to survival equipment is given including development course, sorts, carrying methods, its role in aviation survival and its development tendency. It is indicated that survival equipment will still play an important role in aviation survival within quite a time and it is also imperative to perfect aircrew survival equipment system from improving its performance, increasing its tactical using background and improving its supply system of ordering goods.