What is already known about this topic? Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) reinfection by variants is being reported commonly and has caused waves of epidemic in many countries. Because of dynamic zero policy, the SARS-CoV-2 reinfection was less reported in China. What is added by this report? SARS-CoV-2 reinfections were observed in Guangdong Province between December 2022 and January 2023. This study estimated that the reinfection incidence was 50.0% for the original strain primary infections, 35.2% for the Alpha or Delta variants, and 18.4% for the Omicron variant; The reinfection incidence within 3-6 months after primary infection by Omicron variant was 4.0%. Besides, 96.2% reinfection cases were symptomatic while only 7.7% sought medical attention. What are the implications for public health practice? These findings suggest a reduced likelihood of an Omicron-driven epidemic resurgence in the short term but emphasize the importance of maintaining vigilant surveillance of emerging SARS-CoV-2 variants and conducting population-based antibody level surveys to inform response preparedness.
Due to the significant temperature difference and high solar radiation in high-altitude areas, the asphalt pavement has been in freeze-thaw cycles and radiation service conditions for a long time, resulting in a shorter service life. To extend the service life of asphalt pavement in high-altitude areas, this study uses basalt fiber to toughen the asphalt mixture, and the service characteristics of the asphalt pavement under the coupled effects of freeze-thaw cycles and aging were evaluated. First, the freeze-thaw cycles, aging time, and basalt fiber content were selected as independent variables to conduct the Box–Behnken design (BBD) test design. Consequently, the corresponding response surface model was established. Based on the rutting test, three-point bending test, and indirect tensile test, the optimum content of basalt fiber was obtained. Finally, the fatigue properties of the asphalt mixture by the four-point bending fatigue test were compared under the optimum content. The results showed the consequences of freeze-thaw cycles will reduce the road properties of asphalt and give rise to damage to the asphalt; among them, the indirect tensile strength was decreased by 21.7% at most (the number of freeze-thaw cycles from 10 to 30). Aging will reduce the fatigue life of the asphalt mixture, but its dynamic stability, flexural tensile strength, and slitting strength will be enhanced to a certain extent; among them, the dynamic stability can be improved by up to 28.1% (aging from 4 to 12 h). Basalt fiber can increase the flexural tensile strength, dynamic stability, and spitting strength; the optimum content is 0.35% of asphalt mixtures. Furthermore, the fatigue life of basalt fiber-reinforced asphalt mixture can be significantly improved, which can reduce the influence of freeze-thaw cycles and aging. In addition, the unit price of basalt fiber-reinforced asphalt mixture is only 6.9% higher than that of SBS-modified asphalt mixture, which has significant economic benefits. Under experimental conditions, the effect of aging on the properties of the asphalt mixture is greater than that of the freeze-thaw cycle. This research shows that careful consideration of the road behavior of basalt fiber-reinforced asphalt mixture under freeze-thaw cycles and aging is essential for the pavement durability design.
Objective: To observe the state of breast development of the healthy females of the right age in different regions. Methods: We randomly chose 1540 of 18 -25 years old unmarried or married healthy females of the right age from both Guangxi and Yunnan provinces separately for regular checkups. Also we took notes on these females' height and chest circumference and other indexes. According to the perfect chest circumference of Chinese females in relation to height, namely this relational expression-Standard Circumference = Height × 0.53, we evaluated the basic state of breast development of females from the two areas and then presented related research conclusions. Results: After the statistical analyses on every index of 1540 cases of healthy females of the right age from the two areas each, we found that the breast development of healthy women of the right age in Yunnan is more perfect than that of Guangxi, and in comparison to every index, there is a remarkable difference, and that is, P < 0.01. Conclusions: The state of breast development of healthy females of the right age is different in different areas. Some breasts are especially big; some are a little bit smaller; some are proper and some are relatively flat; also some breasts are strong while some are pendulous. In a word, there are some differences. These differences exist not only in China but also in every part of the world. The female whose chest circumference tends to be more close to the perfect is more likely to be more confident and more active, and also her life is full of sensibility and charm.
Object: To explore a better treatment on the female urogenital tract mycoplasma infection so as to ensure the health of female reproduction. Method: 115 female patients with urogenital tract mycoplasma infection are selected, including 63 patients acted as a group for intermittent medication treatment; that is to say, the ones that are confirmed to be sensitive drugs to those 63 patients are chosen, and let them take this medication for 15 days and stop taking it for 7 days and after that continue to take it for 10 days. The other 52 patients in the other group which acts as a contrast to the former group are cured with a course of conventional treatment for 15-21 days. Results: As to those 115 female patients with urogenital tract mycoplasma infection, 43 patients get relapsed, and 27 patients of them are in the contrast group and 16 patients are in the treatment group. There is obvious difference on the contrast of relapse rate between the treatment group and contrast group, and they are P < 0.01. But as to the sensitive testing results of 10 common antibiotic medicines, there are cases of illness of relapse in those 2 groups, and the rate of drug sensitivity in the treatment group is higher than that of the contrast group. Between treatment group and contrast group, there is obvious difference in the sensitivity of the drugs, P < 0.05 average. Conclusion: When the female patients with urogenital tract mycoplasma infection are cured with a traditional treatment, because of the side effects of drugs, they are not likely to take medicines that are required to making the cure rate become lower and the relapse rate become higher. But intermittent medication is designed with the half-life period of medicine, which makes the medicine can be digested and absorbed easily, and the cure rate is high and the relapse rate is low. With this research we found a more effective method of the treatment on the female urogenital tract mycoplasma infection and showed the clinical significance in intermittent medication.
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