HPAI H7N9 Cluster Zhaoqing Guangdong

[niman]

WHO has reported a cluster involving sisters (45F & 43F) who were reported by CHP as being in Zhaoqing (likely hospitalization location).  Index case has died, while sister discharged.  Sequence from sister was HPAI and Tamiflu resistance (but did not have E627K).

[niman]

• A 45-year-old female (previously reported on 9 January) from Sihui city, Guangdong province. She had symptom onset on 17 December 2016, and died on 24 December 2016. She was exposed to poultry. Another case was a 43-year-old female from Guangzhou city, Guangdong province. She had symptom onset on 30 December 2016 and was admitted to hospital on the same day. She is the sister of the 45-year old female described above. She took care of her hospitalized sister but also had exposure to poultry. At the time of reporting, she was suffering from pneumonia.

http://www.who.int/csr/don/20-february-2017-ah7n9-china/en/

[niman]

Guangdong Zhaoqing 45 F Fatal 05/01/2017 

http://www.chp.gov.hk/files/pdf/2017_avian_influenza_report_vol13_wk01.pdf

[niman]

Guangdong Zhaoqing 43 F Pneumonia 17/01/2017 

http://www.chp.gov.hk/files/pdf/2017_avian_influenza_report_vol13_wk03.pdf

[niman]

Isolate name:
A/Guangdong/17SF003/2016 
Isolate ID:
EPI_ISL_249309 
Passage details/history:
E1 
Type:
A / H7N9 
Lineage:

Sample information
Collection date:
2016-12-29 
Host
Human 
Additional host information:

Zip code:

Patient status:

Last vaccinated:

In-vivo pathogenicity test:

Location:
China 
Additional location information:
Guangdong 
Patient age:
43 Year(s) 
Gender:
Female 
Outbreak:

Treatment:

Specimen source:

Institute information
Originating lab:

Sample ID given by the sample provider:

Address:

Submitting lab:
WHO Chinese National Influenza Center

Sample ID given by the submitting laboratory:

Authors:

Address:
WHO Chinese National Influenza Center
Virology Institute, Chinese CDC
155 Changbai Road, Changping District, 
Beijing 102206
China

Publication
Publication
In vivo antiviral resistance
Phenotype
Genotype
Unspecified
Antiviral resistance tested by experimental procedures
Adamantanes:
Unknown 
Oseltamivir:
Unknown 
Zanamivir:
Unknown 
Peramivir:
Unknown 
Other:
Unknown 










Additional information
Antigenic characterization:

Note:

Sequence
segment identifier length accession # INSDC Sequence

PB2
A/Guangdong/17SF003/2016-PB2
2280
EPI919604


PB1
A/Guangdong/17SF003/2016-PB1
2274
EPI919605


PA
A/Guangdong/17SF003/2016-PA
2151
EPI919603


HA
A/Guangdong/17SF003/2016-HA
1695
EPI919607


NP
A/Guangdong/17SF003/2016-NP
1497
EPI919600


NA
A/Guangdong/17SF003/2016-NA
1398
EPI919606


MP
A/Guangdong/17SF003/2016-MP
982
EPI919602


NS
A/Guangdong/17SF003/2016-NS
838
EPI919601

Submitter information
Submitter:
Yang, Lei 
Submission Date:
2017-02-20 
Last modifier:
Yang, Lei 
Last modified:
2017-02-20 
Address:
WHO Chinese National Influenza Center
Virology Institute, Chinese CDC
155 Changbai Road, Changping District, 
Beijing 102206
China

[niman]

Disease outbreak news 

27 February 2017

On 18 February 2017, the National Health and Family Planning Commission of China (NHFPC) reported to WHO the results of genetic sequencing on virus isolates from two previously reported cases of human infection with avian influenza A(H7N9) virus from Guangdong province. Changes at the cleavage site of the HA gene suggestive of being highly pathogenic to poultry was confirmed by the Chinese National Influenza Centre of the Chinese Centre for Disease Control and Prevention (China CDC).

Details of the cases

The two cases were reported through International Health Regulations (IHR) notification on 19 January 2017.

• A 43-year-old female with symptom onset on 29 December 2016. The case recovered. She had poultry exposure but also cared for her sister who was hospitalized with avian influenza A(H7N9). This was reported as a family cluster.
• A 57-year-old male with symptom onset on 5 January 2017. The case is still hospitalized and in critical condition as of 22 February 2017. He was reported to have had poultry exposure.

Investigation revealed exposure to sick and dead poultry. None of the 105 close contacts of these two cases developed symptoms during the two weeks of medical observation. To date, there is no evidence of changes in pathogenicity to and transmissibility among humans.

Public health response

Considering the new developments in H7N9 genetic sequence, the Chinese government is implementing additional measures in Guangdong province on top of current existing measures:

• Closure of markets for cleaning.
• Emergency monitoring of poultry markets and flocks.
• Culling of flocks if the strain is confirmed in them.

WHO risk assessment

This is the first report of avian influenza A(H7N9) virus, since its emergence in 2013, having genetic sequences that are suggestive of evolving from a low pathogenic into a highly pathogenic avian virus. Similar changes at the cleavage site of the HA gene were also found in genetic sequence data uploaded in Global Initiative on Sharing Avian Influenza Data (GISAID) of a virus from a recent human case reported by Taiwan, China earlier to WHO on 4 February 2017 with travel history to Guangdong. In addition the Ministry of Agriculture China reported to World Organisation for Animal Health (OIE) on 21 February 2017 that genetic sequences of virus samples from live poultry markets in Guangdong also showed changes consistent with highly pathogenic avian influenza viruses. So far the above genetic changes have been found in viruses from human, poultry and environmental samples from Guangdong or with travel history to Guangdong province.

In addition the genetic sequences from the two human cases from Guangdong and the case reported by Taiwan, China showed amino acid substitutions associated with neuraminidase inhibitor antiviral drug resistance. It was reported that the three patients received antiviral treatment before samples were taken.

So far there is no evidence of change of epidemiological patterns of avian influenza A(H7N9) infection in humans. There is no evidence that a change in the virus from low pathogenic to high pathogenic avian influenza virus has an impact on the pathogenicity or transmissibility in humans.

Overall the likelihood of further community level spread remains low.

WHO is closely monitoring the impact of these viruses on public health through its Global Influenza Surveillance and Research System (GISRS) network, and its effect on animal health through collaboration with Food and Agriculture Organization of the United Nations (FAO) and OIE, and will update public health risk assessment accordingly.

A change in the virus from low pathogenicity to highly pathogenicity in poultry may have implications on surveillance and control strategies at the animal sector.

WHO advice

WHO advises that travellers to countries with known outbreaks of avian influenza should avoid, if possible, poultry farms, contact with animals in live poultry markets, entering areas where poultry may be slaughtered, or contact with any surfaces that appear to be contaminated with faeces from poultry or other animals. Travellers should also wash their hands often with soap and water, and follow good food safety and good food hygiene practices.

WHO does not advise special screening at points of entry with regard to this event, nor does it currently recommend any travel or trade restrictions. As always, a diagnosis of infection with an avian influenza virus should be considered in individuals who develop severe acute respiratory symptoms while travelling in or soon after returning from an area where avian influenza is a concern.

WHO encourages countries to continue strengthening influenza surveillance, including surveillance for severe acute respiratory infections (SARI) and influenza-like illness (ILI) and to carefully review any unusual patterns, ensure reporting of human infections under the IHR 2005, and continue national health preparedness actions.

http://www.who.int/csr/don/27-february-2017-ah7n9-china/en/

[niman]

Comments on cluster confusion

http://recombinomics.co/thedrnimanshow/2017/02/022717.mp3