Table 1. Mutations in haemagglutinin 1 of viral sequences recovered from an infected patient and from environmental samples collected nearby, compared to candidate vaccine strain A/Guangdong/17SF003/2016(H7N9), Inner Mongolia Autonomous region, China, April 2019^a .

Strain name	Passage	Sites number (H7 numbering)
		9	22	47b	71	78	114b	116	125b	134b	151	163	169	184	261	301
A/Guangdong/17SF003/2016(H7N9)	E1	A	R	R	E	I	G	T	V	S	A	K	I	K	R	K
A/Gansu/23277/2019(H7N9)	Original	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Gansu/23276/2019(H7N9)	Original	S	K	K	K	V	R	K	A/T	P	T	R	V	R	G	R
A/Gansu/23275/2019(H7N9)	Original	S	K	K	K	V	R	K	A/T	P	T	R	V	R	G	R
A/Gansu/23277/2019(H7N9)	E1	S	K	K	K	V	R	E	T	P	T	R	V	R	G	R
A/Gansu/23276/2019(H7N9)	E1	S	K	K	K	V	R	K	A	P	T	R	V	R	G	R
A/Gansu/23275/2019(H7N9)	E1	S	K	K	K	V	R	K	A	P	T	R	V	R	G	R
A/Gansu/23447/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Gansu/23453/2019(H7N9)	E1	S	K	K	K	V	R	K	A	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23280/2019(H7N9)	Original	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23286/2019(H7N9)	Original	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23287/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23286/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23285/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23283/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23280/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R
A/Environment/Inner Mongolia/23278/2019(H7N9)	E1	S	K	K	K	V	R	K	T	P	T	R	V	R	G	R

NA: not applicable.

^a Environmental samples were collected 4 days after the first specimen was obtained from the patient.

^b Previously reported immune escape mutation.