Short-term acceptability of female condom use among low-fee female sex workers in China: a follow-up study.

BACKGROUND: Low-fee female sex workers (FSW) lack power to effectively negotiate male condom use with clients. Female condoms (FCs) may provide an alternative strategy. This study was conducted to assess the acceptability of FC use among low-fee FSWs, and to identify appropriate candidates for future FC promotion. METHODS: A one-month follow-up study was conducted. At entry into the study, eligible participants completed a baseline questionnaire and were given 10 FCs. At the one-month follow up encounter, the number of used FC packages were counted and each participant completed a follow-up questionnaire. Logistic regression was used to identify variables associated with more frequent use of FCs (> 2 times). RESULTS: A total of 312 low-fee FSWs were enrolled at baseline and all participants completed the follow-up evaluation. Among them, 123 (39.4%) participants had used more than two FCs. Participants who were illiterate or had completed at most primary school education (OR: 2.4, 95% CI: 1.4-7.2), charged ≤30 RMB per client (≤30 vs. 51-80 RMB, OR: 3.8, 95% CI: 1.9-7.6), or had consistently used condoms with regular clients in the past month (OR: 2.4, 95%CI: 1.4-4.2) were more likely to use FCs. CONCLUSION: Low-fee FSWs charging ≤30 RMB per client, and those who are less educated may be appropriate initial candidates for FC promotion in China. Strategies to consider include teaching FSWs tactics for negotiation of FC use that can initially be applied with regular clients, and providing education to maximize ease-of use, and minimize discomfort with FC usage.

[Risk factors for recurrent wheezing in infants and young children suffering from dust mite allergy after their first wheezing].

OBJECTIVE: To investigate the risk factors for recurrent wheezing in infants and young children suffering from dust mite allergy after their first wheezing. METHODS: A total of 1 236 infants and young children who experienced a first wheezing episode and were hospitalized between August 2014 and February 2015 were enrolled, among whom 387 were allergic to dust mites. These infants and young children were followed up to 1 year after discharge. A total of 67 infants and young children who experienced 3 or more recurrent wheezing episodes within 1 year were enrolled as the recurrent wheezing group, while 84 infants and young children who did not experience recurrent wheezing during follow-up were enrolled as the control group. Univariate analysis and multivariate logistic stepwise regression analysis were performed to investigate the risk factors for recurrent wheezing in these patients. RESULTS: The univariate analysis showed that the age on admission, wheezing time before admission, Mycoplasma pneumoniae infection rate, and influenza virus infection rate were associated with recurrent wheezing. The multivariate logistic stepwise regression analysis showed that the older age on admission (OR=2.21, P=0.04) and Mycoplasma pneumoniae infection (OR=3.54, P=0.001) were independent risk factors for recurrent wheezing. CONCLUSIONS: Infants and young children who are allergic to dust mites, especially young children, have a significantly increased risk of recurrent wheezing if they are complicated by Mycoplasma pneumoniae infection during the first wheezing episode.

[Assessment of the young rat model of visceral hypersensitivity by measuring electrical discharge of external oblique].

OBJECTIVE: To study the value of measuring electrical discharge of external oblique in assessment of young rat model of visceral hypersensitivity. METHODS: Eight-day-old neonatal Sprague-Dawley rats were randomly assigned to two groups: an experimental group and a control group (n=16 each). Rats in the experimental group were subjected to mechanical colorectal irritation daily for 7 consecutive days, while the rats in the control group did not received colorectal irritation treatment. On the 6th week of their lives, the spike amplitude of external oblique were measured to evaluate the bowel sensitivity. RESULTS: When the colorectal distention (CRD) pressure was 30 and 45 mmHg, the 95% confidence interval of the spike amplitude in the experimental group was significantly higher than that in the control group (P<0.01). When the CRD pressure were 60 and 75 mmHg, the 95% confidence interval of the spike amplitude in female rats was significantly higher than that in males (P<0.05). CONCLUSIONS: The electrical discharge of external oblique confirmed that chronic colorectal irritation in neonatal rats can result in a chronic visceral hypersensitivity in the juvenile stage, with gender differences. Electrophysiological assessment is a quantitative test, and can objectively reflect visceral sensibility of pain.

Identification and Funtional Characterization of Three Postsynaptic Short-chain Neurotoxins from Hydrophiinae, Lapemis hardwickii Gray.

Three cDNA clones, sn12, sn36 and sn160, encoding isoforms of postsynaptic short-chain neurotoxins, were cloned by screening a cDNA library of the venom from Hydrophiinae, Lapemis hardwickii Gray. The sequences of three cDNA clones encoded proteins consisting of 60 amino acid residues. There was only one amino acid substitution among the three isoforms SN12, SN36 and SN160 at the position 46 of mature proteins, and they were Pro(46), His(46) and Arg(46), respectively. The three molecules were expressed in Escherichia coli and the recombinant proteins were characterized. Different LD(50) were obtained, namely 0.0956 mg/kg, 0.3467 mg/kg and 0.2192 mg/kg, when the SN12, SN36 and SN160 were injected into Kunming mice(i.p.). In analgesic effect assayed by the acetic acid-induced writhing method, SN12 and SN160 showed similar analgesic effect, but SN36 had effects significantly different with the other two. Our studies suggested that the amino acid residues on position 46 could affect the combination between the postsynaptic short-chain neurotoxins and the nicotinic acetylchoine receptor, since different amino acid substitution resulted in different biological activities.