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This study aimed to assess the prevalence of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) total antibodies in the north, middle, and south regions of West Bank and the prevalence of SARS-CoV-2 specific antibodies (IgA, IgM, and IgG) in the Palestinian population. This was a cross-sectional study. The serological and epidemiological data of 1269 persons were assessed. Participants were selected randomly among primary health care center attendees in Palestine between November 1, 2020 and December 31, 2020. All serum samples were tested for total antibodies using an enzyme-linked immunosorbent assay (ELISA) test. IgM, IgG, and IgA-specific antibody titers were measured using ELISA. The overall prevalence (with 95% confidence intervals [CIs]) of SARS-CoV-2 total antibodies and specific antibodies were estimated. A multivariate regression model was used to assess the predictive factors for SARS-CoV-2-specific antibodies. The overall seroprevalence of SARS-CoV-2 antibodies was 24·0% (95% CI, 21·7%–26·5%). Seroprevalence was significantly higher among people living in south West Bank (adjusted Odds ratio [aOR], 2·22; 95% CI: 1·58–3·11), people who had COVID-19 symptoms (aOR, 3·92; 95% CI, 2·83–5·43), people with a COVID-19 contact history (aOR, 1·44; 95% CI, 1·03–2·03), patients with hypertension (aOR, 1·57; 95% CI, 1·06–2·33), and non-smokers (aOR, 0·47; 95% CI, 0·31–0·72). A total of 171 blood samples from SARS-CoV-2-positive patients were chosen at random for additional serological testing. Specific IgM, IgG, and IgA antibodies were positive in 14·0% (95% CI, 9·2%–20·2%), 88·3% (82·5%–92·7%), and 42·1% (34·6%–59·9%) of the samples, respectively. SARS-CoV-2 antibodies were common among PHC center attendees and were significantly associated to sex, smoking, and COVID-19 contact history. However, considering that almost three-quarters of this population remains susceptible, maintaining public health measures and encouraging access to immunization is critical in protecting this population.

The ' 'Fr P decay was reinvestigated using high-resolution single y spectrometry as well as y-y coincidence techniques. For single y-spectra measurements, radiochemically pure Fr sources were obtained by chromatographic separation from a 75 MBq activity Ac parent source and continuously purified of Ra and daughters. The analysis of the y spectra of 30 sources showed the existence of 131 y lines, of which 87 are reported for the first time in the ' 'Fr f3 decay although many of them are observed following the ' 'Th o. decay. The ' Fr half-life was remeasured and found to be T,~2=22. 00+0.07 min. y-y-t coincidence measurements were also carried out with Fr purified sources. TheRa level scheme was built on the basis of our y data, as well as Th a-decay data.Among the 32 excited Ra levels, of which 22 were also known from Th o. decay, 13 are newly reported from Fr f3 decay. Low energy levels (E &400 keV) may be classified as parity doublet bands according to the predictions of the reAection asymmetric rotor model. Above a 700 keV gap, a coexistence of symmetric and asymmetric shapes including both static and dynamic octupole correlations is suggested.PACS number(s): 23.40.s, 23.20.Lv, 27.90.+b