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. 2021 Oct 7;12:743048. doi: 10.3389/fmicb.2021.743048

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Copyright © 2021 Niavarani, Poustchi, Shayanrad, Sharafkhah, Mohammadi, Mansour-Ghanaei, Joukar, Roshandel, Hormati, Ghadimi, Sadeghniiat-haghighi, Abdollahi, Mardani, Bahadorimonfared, Ghanbari, Delavari, Vosoogh-Moghaddam, Zamani, Roozafzai, Alvand, Darvishian and Malekzadeh.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Association of the systemic, respiratory, and GI symptoms at the baseline and after 3-month FU with ABO blood groups and chest computed tomography (CT)-scanning. (A) The ratio of symptomatic cases with certain ABO blood groups. (B) The mean number of symptomatic cases with particular ABO blood groups. (C) The ratio of symptomatic cases with and without a positive lung CT-scanning. (D) The mean number of symptomatic cases with and without a positive lung CT-scanning. (CT: computed tomography, FU: follow-up, and GI: gastrointestinal). *unpaired two-tailed Student’s t-test, P < 0.05. **unpaired two-tailed Student’s t-test, P < 0.01. ***unpaired two-tailed Student’s t-test, P < 0.001.