This week’s update from Washington State showing vaccine breakthrough cases and which Sars-CoV-2 variant is causing them up to 15th September 2021.  The Delta variant continues to be the leading cause of breakthrough infections in the state, however a big drop in the number of cases being sequenced means that this data doesn’t have much statistical relevance to the actual number of breakthrough infections occurring.

The data might, however, be a useful indicator of the rising importance of new variants in the future, and on that basis we will continue to publish the information

 

 

 

 

Vaccine Breakthroughs up to 15th September 2021

15th Sept 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	407	12%	31%	5
Gamma	P.1	202	6%	7%	3
Epsilon	B.1.429	126	4%	11%	2
Delta	B.1.617.2	2450	73%	30%	190
Iota	B.1.526	35	1%	3%	1
Beta	B.1.351	11	0%	1%	0
Epsilon	B.1.427	13	0%	1%	0
Eta	B.1.525	4	0%	0%	0
Kappa	B.1.617.1	3	0%	0%	0
B.1.617.3	B.1.617.3	0	0%	0%	0
Other	Other	108	3%	15%	3
Total	Total	3359	100%	100%	204

 

Vaccine Breakthroughs up to 8th September 2021

8th Sept 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	402	13%	32%	3
Gamma	P.1	199	6%	7%	3
Epsilon	B.1.429	124	4%	11%	0
Delta	B.1.617.2	2260	72%	29%	423
Iota	B.1.526	34	1%	2%	0
Beta	B.1.351	11	0%	1%	0
Epsilon	B.1.427	13	0%	1%	0
Eta	B.1.525	4	0%	0%	0
Kappa	B.1.617.1	3	0%	0%	0
B.1.617.3	B.1.617.3	0	0%	0%	0
Other	Other	105	3%	16%	-7
Total	Total	3155	100%	100%	422

 

Vaccine Breakthroughs up to 1st September 2021

1st Sept 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	399	15%	33%	1
Gamma	P.1	196	7%	8%	-2
Epsilon	B.1.429	124	5%	12%	0
Delta	B.1.617.2	1837	67%	25%	443
Iota	B.1.526	34	1%	2%	0
Beta	B.1.351	11	0%	1%	0
Epsilon	B.1.427	13	0%	1%	1
Eta	B.1.525	4	0%	0%	0
Kappa	B.1.617.1	3	0%	0%	0
B.1.617.3	B.1.617.3	0	0%	0%	0
Other	Other	112	4%	18%	-111
Total	Total	2733	100%	100%	332

 

Vaccine Breakthroughs up to 25th August 2021

25th 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	1394	58%	18%	546
Alpha	B.1.1.7	398	17%	31%	40
Gamma	P.1	198	8%	7%	12
Epsilon	B.1.429	124	5%	11%	7
Iota	B.1.526	34	1%	2%	6
Epsilon	B.1.427	12	0%	1%	1
Beta	B.1.351	11	0%	1%	1
Eta	B.1.525	4	0%	0%	0
Kappa	B.1.617.1	3	0%	0%	0
Other	Other	223	9%	27%	-540
Total	Total	2401	100%	100%	73

 

Vaccine Breakthroughs up to 18th August 2021

18th 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	848	36%	12%	219
Alpha	B.1.1.7	358	15%	30%	6
Gamma	P.1	186	8%	7%	4
Epsilon	B.1.429	117	5%	11%	1
Iota	B.1.526	28	1%	2%	0
Epsilon	B.1.427	11	0%	1%	0
Beta	B.1.351	10	0%	1%	0
Eta	B.1.525	4	0%	0%	0
Kappa	B.1.617.1	3	0%	0%	2
Other	Other	763	33%	35%	676
Total	Total	2328	100%	100%	908

 

Vaccine Breakthroughs up to 11th August 2021

11th 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	629	44%	12%	224
Alpha	B.1.1.7	352	25%	39%	9
Gamma	P.1	182	13%	9%	7
Epsilon	B.1.429	116	8%	14%	0
Iota	B.1.526	28	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	87	6%	20%	37
Total	Total	1420	100%	100%	278

 

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
Alpha	B.1.1.7	309	41%	44%	12
Gamma	P.1	147	19%	10%	6
Epsilon	B.1.429	113	15%	16%	0
Delta	B.1.617.2	90	12%	4%	20
Iota	B.1.526	22	3%	3%	1
Beta	B.1.351	11	1%	1%	0
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	49	6%	20%	0
Total		757	100%	100%	39

 

Vaccine Breakthroughs up to 7th July 2021

7th 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	297	41%	44%	11
Gamma	P.1	139	19%	9%	6
Epsilon	B.1.429	113	16%	16%	0
Delta	B.1.617.2	70	10%	4%	30
Iota	B.1.526	21	3%	3%	7
Beta	B.1.351	11	2%	1%	1
Epsilon	B.1.427	11	2%	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		49	7%	20%	0
Total		716	100%	100%	55

 

Vaccine Breakthroughs up to 30th June 2021

30th June 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
Alpha	B.1.1.7	286	37%	38%
Gamma	P.1	133	17%	8%
Epsilon	B.1.429	113	15%	14%
Delta	B.1.617.2	40	5%	2%
Iota	B.1.526	14	2%	3%
Beta	B.1.351	10	1%	1%
Epsilon	B.1.427	11	1%	2%
Eta	B.1.525	4	1%	0%
Kappa	B.1.617.1	1	0%	0%
Zeta	P.2	0	0%	0%
Other		49	21%	32%
Totals		661	100%	100%

 

 

 

Image by kola05 from Pixabay