. 2021 Feb 4;7(1):veab006. doi: 10.1093/ve/veab006

Table 1.

Frequency of SARS-CoV-2 genomes with 1 or more 200 nt gaps (N200) by month and by sequencing platform.

Deposition period	Complete genomes^a	Genomes with 1 or more N200^b	%. with 1 or more N200^c	Illumina total^d	Illumina % with N200^e	MinION total^f	MinION % with N200^g	Ion Torrent total^h	Ion Torrent % with N200ⁱ	Method unclear^j	Method unclear % with N200^k
1–31 January 2020	54	1	2	9	0	2	0	0	0	43	2
1–29 February 2020	126	2	2	44	0	9	0	5	0	65	4
1–31 March 2020	2,872	559	19	1,518	16	548	32	35	6	771	18
1–30 April 2020	12,411	3,745	30	4,970	38	1,286	27	264	0	5,424	26
1–31 May 2020	19,787	8,606	43	8,634	52	2,634	30	529	0	7,990	42
1–30 June 2020	21,665	8,723	40	7,043	36	3,844	35	629	2	10,149	47
1–31 July 2020	17,986	4,834	27	4,965	23	1,585	33	471	2	10,965	29
1–31 August 2020	17,276	4005	23	11,074	22	2,270	26	486	0	3,446	28
1–30 September 2020	38,227	10,611	28	22,740	23	7,973	44	580	1	6,934	28

Number of genomes with the annotation ‘complete’ retrieved from GISAID (https://www.gisaid.org/).

Genomes were sorted by the presence or absence of the sequence N200.

((The number of genomes with at least one N200)/total number of genomes)*100.

Number of genomes in GISAID for this period generated using any of the Illumina methods as noted in the GISAID ‘Sequencing technology metadata’.

((The number of Illumina genomes with at least one N200)/total number of genomes)*100.

^f,g

Number of genomes in GISAID for this period generated using any of the MinION methods as noted in the GISAID ‘Sequencing technology metadata’ and their percentage.

^h,i

Number of genomes in GISAID for this period generated using any of the Ion Torrent methods as noted in the GISAID ‘Sequencing technology metadata’ and their percentage.

^j,k

Number of genomes in GISAID for this period generated using unclear methods as noted in the GISAID ‘Sequencing technology metadata’ and their percentage.