Relevant SARS-CoV-2 Genome Variation through Six Months of Worldwide Monitoring

Table 2

Distribution of the number of genome samples () and the number of transition (Ti) and transversion (Tv) mutations and the Ti/Tv ratio for data from each location during different periods of virus collection. A chi-squared test was used to compare the distribution of mutation types by period for each location and to compare the mutation type by location for each period. NA: data not available or sample number under 20.

Period of collection	January	February	March	April	May	June	value
Africa ()							0.9134
	NA	NA	142	210	78	139
Ti, (%)	NA	NA	64 (76.19)	80 (72.07)	139 (73.54)	67 (72.04)
Tv, (%)	NA	NA	20 (23.81)	31 (27.93)	50 (26.46)	26 (27.96)
Ti/Tv			3.2	2.58	2.78	2.58
Asia ()							0.8918
	379	551	1247	1025	685	418
Ti, (%)	30 (78.95)	36 (72)	38 (70.37)	44 (69.94)	56 (68.3)	65 (73.03)
Tv, (%)	8 (21.05)	14 (28)	16 (29.63)	19 (30.16)	26 (31.7)	24 (26.97)
Ti/Tv	3.75	2.57	2.37	2.32	2.15	2.7
Europe ()							0.1793
	21	196	10025	10450	3003	631
Ti, (%)	86 (71.67)	55 (84.62)	37 (80.43)	33 (75)	42 (66.67)	117 (70.9)
Tv, (%)	34 (28.33)	10 (15.38)	9 (19.57)	11 (25)	21 (33.33)	48 (29.02)
Ti/Tv	2.53	5.5	4.11	3	2	2.34
North America ()							0.7178
	20	106	5370	3858	1051	473
Ti, (%)	18 (75)	91 (77.75)	32 (74.42)	42 (75)	72 (76.6)	61 (74.39)
Tv, (%)	6 (25)	26 (22.22)	11 (25.58)	14 (25)	22 (23.4)	21 (25.61)
Ti/Tv	3	3.5	2.90	3	3.27	2.90
Oceania ()							0.2222
	NA	32	1315	362	88	107
Ti, (%)	NA	26 (82.53)	57 (75)	61 (75.31)	132 (72.13)	185 (68.01)
Tv, (%)	NA	6 (17.65)	19 (25)	20 (24.61)	51 (27.87)	87 (31.99)
Ti/Tv		4.67	3	3.05	2.59	2.12
South America ()							0.6071
	NA	NA	289	207	23	22
Ti, (%)	NA	NA	39 (72.22)	58 (80.56)	53 (75.71)	32 (82.1)
Tv, (%)	NA	NA	15 (27.78)	14 (19.44)	17 (24.29)	7 (17.9)
Ti/Tv	NA	NA	2.6	4.14	3.12	4.6
value	0.6654	0.4094	0.8990	0.77753	0.68839	0.52399