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    • With increasing usage of colistin as the

    2018-11-15

    With increasing usage of colistin as the last therapy for many refractory clinical infections, resistance to colistin is becoming more widespread. Taken together, the data clearly show that the principal mechanism of colistin resistance in the Col-R and Col-D clinical A. baumannii strains is the loss of LPS due to the mutation in one of the first three genes involved in lipid A biosynthesis. Elevated Q-VD(OMe)-OPh cost of pmrA and pmrB may be present in Col-R and Col-D clinical strains, and may serve as an additional mechanism of colistin resistance in A. baumannii strains.
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    Acknowledgments
    Background Cervical cancer is the second common cancer and the fourth leading cause of cancer death in females worldwide. In China, over 130,000 new cases are diagnosed every year. Molecular epidemiologic evidences clearly indicate that human papillomaviruses (HPV) is the crucial cause of cervical intraepithelial neoplasia and invasive cervical cancer. Subtypes of HPV are divided into low-risk and high-risk types according to their presumed oncogenic potential. According to accumulated evidence, the major causative factor is persistent infection with high-risk HPV in the development of cervical intraepithelial neoplasia and invasive cervical cancer. Moreover, high-risk HPV is also found to be a pathogenic factor associated with other cancers, such as vulva, vaginal, rectal and oral cancer. But the distribution of HPV subtypes is different, both geographically and among populations. And data on HPV type-specific prevalence in different populations are important for elucidating the impact of HPV and constructing effective vaccine.
    Objectives
    Study design
    Results
    Discussion Accumulated epidemiological studies have shown that the distribution of HPV subtypes has a significant difference in geographical region. HPV-16 (17.6%) was still the most prevalent subtype in Sichuan, consistent with Chen’s previous findings, and was consistent with other different world regions. This study has significant differences with Chen et al. First, the number of participants was much larger than that of Chen et al., and the participants came from different places in Sichuan. Secondly, the statistical time span was 8years, ending on December 31, 2016. Finally, the type of statistics was much more than the former, the statistical algorithm was also different from the former. These differences made the results of Dominant allele study different from those of Chen et al. The prevalence of HPV-52 (17.4%) and HPV-58 (12.4%) in Sichuan, after HPV-16, is different from that of Beijing (HPV-58, 43) and Fujian (HPV-33, 52), but is consistent with more regions in China. This result clearly shows that HPV-52 and HPV58 are the two most important subtypes in China, except for HPV16. In addition, HPV-52 prevalence in this study exceeded HPV16 in 2015 and 2016, becoming the highest prevalence of HPV subtype, and similar results were found in other regions, such as Shanghai, indicating that HPV-52 is becoming the most common high-risk subtype in China. This result reminds us that the severity of HPV-52 was sharply increased and more attention should be placed on the prevention of HPV-52 infection. In this study, although HPV-16 is the most common subtype in Sichuan, its infection rate decreased significantly in the past 8years, and the decline rate was large. On the contrary, HPV-52 infection rate ranking from fourth to first, the growth trend was obvious. High prevalence of HPV-52 was also found in Qingdao, Hunan, Henan, Ningbo, Shanghai and other regions, which indicates that HPV-52 in China has a very high prevalence, and also reflects the geographical specificity of distribution of HPV subtypes. The reason for the decline in HPV-16 infection rate may be related to the following factors: a. HPV-16 and HPV-18 are the most common high-risk subtypes in the world, so vaccines targeting HPV-16 and HPV-18 (Cervarix and Gardasil) are more widely used, leading to the reduced prevalence of HPV16; b, most of the HPV screening programs are also focused on the fight against HPV16 and HPV18, due to their serious dangers; c, other subtypes such as HPV-52, due to the lack of sufficient attention and effective prevention and treatment measures, become more and more popular, and meanwhile dilute the proportion of HPV-16. This also roughly explains the cause of the increased HPV-52 infection rate. Because of the lack of similar studies on the trend of HPV subtypes infection in China, a deeper reason remains to be found, which requires further in-depth study on HPV transmission, infection and pathogenesis.