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Due to crosswind, the bomb missed the aiming point, the Aioi Bridge, by approximately 240 m (800 ft) and detonated directly over Shima Surgical Clinic. [142] It released the equivalent energy of 16 ± 2 kilotons of TNT (66.9 ± 8.4 TJ). [139] The weapon was considered very inefficient, with only 1.7 percent of its material fissioning. [143]
In 3–4% of cases (7.4% for those over age 65) symptoms are severe enough to cause hospitalisation. [292] Mild cases typically recover within two weeks, while those with severe or critical diseases may take three to six weeks to recover. Among those who have died, the time from symptom onset to death has ranged from two to eight weeks. [107]
Initial estimates of the basic reproduction number (R 0) for COVID-19 in January 2020 were between 1.4 and 2.5, [58] but a subsequent analysis claimed that it may be about 5.7 (with a 95 per cent confidence interval of 3.8 to 8.9).