This week’s update from Washington State showing vaccine breakthrough cases and which Sars-CoV-2 variant is causing them up to 4th August 2021. Of note this week is another big jump for Delta B.1.617.2 vaccine breakthrough cases, which have increased from 254 to 405 in one week. Delta is now responsible for more breakthrough cases in Washington State than any other variant. There are also further small increases in vaccine breakthrough cases for the Alpha and Gamma variants.
Vaccine Breakthroughs up to 4th August 2021
4th August 2021
Variant
Lineage
Number of Vaccine
Breakthrough Cases
With Variant
Percentage of Vaccine
Breakthrough Cases With
Variant
Percentage of
Sequences From
All Covid-19
Cases With
Variant
Increase in
Number of
Breakthroughs
From Previous
Week
Delta
B.1.617.2
405
35%
10%
151
Alpha
B.1.1.7
343
30%
41%
6
Gamma
P.1
175
15%
9%
7
Epsilon
B.1.429
116
10%
15%
0
Iota
B.1.526
27
2%
3%
1
Epsilon
B.1.427
11
1%
2%
0
Beta
B.1.351
10
1%
1%
0
Eta
B.1.525
4
0%
0%
0
Kappa
B.1.617.1
1
0%
0%
0
Other
Other
50
4%
19%
-4
Total
1142
100%
100%
161
Vaccine Breakthroughs up to 28th July 2021
28th July 2021
Variant
Lineage
Number of Vaccine
Breakthrough Cases
With Variant
Percentage of Vaccine
Breakthrough Cases With
Variant
Percentage of
Sequences From
All Covid-19
Cases With
Variant
Increase in
Number of
Breakthroughs
From Previous
Week
Alpha
B.1.1.7
337
34%
43%
29
Gamma
P.1
168
17%
10%
12
Epsilon
B.1.429
116
12%
15%
3
Delta
B.1.617.2
254
26%
7%
141
Iota
B.1.526
26
3%
3%
4
Beta
B.1.351
10
1%
1%
0
Epsilon
B.1.427
11
1%
2%
0
Eta
B.1.525
4
0%
0%
0
Kappa
B.1.617.1
1
0%
0%
0
Zeta
P.2
0
0%
0%
0
Other
Other
54
6%
18%
4
Total
981
100%
100%
193
Vaccine Breakthroughs up to 21st July 2021
21st July 2021
Variant
Lineage
Number of Vaccine
Breakthrough Cases
With Variant
Percentage of Vaccine
Breakthrough Cases With
Variant
Percentage of
Sequences From
All Covid-19
Cases With
Variant
Increase in
Number of
Breakthroughs
From Previous
Week
Alpha
B.1.1.7
308
39%
44%
-1
Gamma
P.1
156
20%
10%
9
Epsilon
B.1.429
113
14%
16%
0
Delta
B.1.617.2
113
14%
4%
23
Iota
B.1.526
22
3%
3%
0
Beta
B.1.351
10
1%
1%
-1
Epsilon
B.1.427
11
1%
2%
0
Eta
B.1.525
4
1%
0%
0
Kappa
B.1.617.1
1
0%
0%
0
Zeta
P.2
0
0%
0%
0
Other
Other
50
6%
19%
0
Total
788
100%
100%
30
Vaccine Breakthroughs up to 14th July 2021
14th July 2021
Variant
Lineage
Number of Vaccine
Breakthrough Cases
With Variant
Percentage of Vaccine
Breakthrough Cases With
Variant
Percentage of
Sequences From
All Covid-19
Cases With
Variant
Increase in
Number of
Breakthroughs
From Previous
Week
