How sure can I be that a zero result means there are no articles that mention the variant I searched?

Quite sure. No search engine will ever achieve 100% sensitivity, but we believe Mastermind to be the most comprehensive source of genomic evidence available. By updating weekly, we keep pace with the rate of publication. See how Mastermind’s database compares to resources here.

1
NC_000001.10
NC_000001.11
2
NC_000002.11
NC_000002.12
3
NC_000003.11
NC_000003.12
4
NC_000004.11
NC_000004.12
5
NC_000005.9
NC_000005.10
6
NC_000006.11
NC_000006.12
7
NC_000007.13
NC_000007.14
8
NC_000008.10
NC_000008.11
9
NC_000009.11
NC_000009.12
10
NC_000010.10
NC_000010.11
11
NC_000011.9
NC_000011.10
12
NC_000012.11
NC_000012.12
13
NC_000013.10
NC_000013.11
14
NC_000014.8
NC_000014.9
15
NC_000015.9
NC_000015.10
16
NC_000016.9
NC_000016.10
17
NC_000017.10
NC_000017.11
18
NC_000018.9
NC_000018.10
19
NC_000019.9
NC_000019.10
20
NC_000020.10
NC_000020.11
21
NC_000021.8
NC_000021.9
22
NC_000022.10
NC_000022.11
X
NC_000023.10
NC_000023.11
Y
NC_000024.9
NC_000024.10
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