Mapping app location data shows how virus spread in China

The previously unknown coronavirus has caused alarm because of its similarity to Severe Acute Respiratory Syndrome (SARS), which killed hundreds across mainland China and Hong Kong in 2002 and 2003. (AFP)
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Updated 09 February 2020

Mapping app location data shows how virus spread in China

  • Research reveals the US, Hong Kong and Australia are among top 10 travel destinations from high-risk Chinese cities

SHANGHAI: For weeks after the first reports of a mysterious new virus in Wuhan, millions of people poured out of the central Chinese city, cramming onto buses, trains and planes as the first wave of China’s great Lunar New Year migration broke across the nation. Some carried with them the new virus that has since claimed over 800 lives and sickened more than 37,000 people.

Officials finally began to seal the borders on Jan. 23. But it was too late. Speaking to reporters a few days after the the city was put under quarantine, the mayor estimated that 5 million people had already left. Where did they go?

Analysis of domestic travel patterns using map data from Chinese tech giant Baidu shows that in the two weeks before Wuhan’s lockdown, nearly 70 percent of trips out of the city were within Hubei province. Baidu has a map app that is similar to Google Maps, which is blocked in China.

Another 14 percent of the trips went to the neighboring provinces of Henan, Hunan, Anhui and Jiangxi. Nearly 2 percent slipped down to Guangdong province, the coastal manufacturing powerhouse across from Hong Kong, and the rest fanned out across China. The cities outside Hubei province that were top destinations for trips from Wuhan between Jan. 10 and Jan. 24 were Chongqing, a municipality next to Hubei province, Beijing and Shanghai.

The travel patterns broadly track with the early spread of the virus. The majority of confirmed cases and deaths have occurred in China, within Hubei province, followed by high numbers of cases in central China, with pockets of infections in Chongqing, Shanghai and Beijing as well.

“It’s definitely too late,” said Jin Dong-Yan, a molecular virologist at Hong Kong University’s School of Biomedical Sciences. “Five million out. That’s a big challenge. Many of them may not come back to Wuhan but hang around somewhere else. To control this outbreak, we have to deal with this. On one hand, we need to identify them. On the other hand, we need to address the issue of stigma and discrimination.”

He added that the initial spread of travelers to provinces in central China with large pools of migrant workers and relatively weaker health care systems “puts a big burden on the hospitals ... of these resource-limited provinces.”

Baidu gathers travel data based on more than 120 billion daily location requests from its map app and other apps that use Baidu’s location services. Only data from users who agree to share their location is recorded and the company says data is masked to protect privacy. Baidu’s publicly available data shows proportional travel, not absolute numbers of recorded trips, and does not include trips by people who don’t use mobile phones or apps that rely on Baidu’s popular location services.

Public health officials and academics have been using this kind of mapping data for years to track the potential spread of disease.

A group of researchers from Southampton University’s WorldPop research group, which studies population dynamics, used 2013-2015 data from Baidu’s location services and international flight itineraries to make a predictive global risk map for the likely spread of the virus from Wuhan.

It’s important to understand the population movements out of Wuhan before the city’s lock down, said Lai Shengjie, a WorldPop researcher who used to work at China’s Center for Disease Control and Prevention.

“Maybe they hadn’t developed symptoms but could transmit the virus. We need to look at destinations across China and the world and focus on the main destinations and try to prepare for disease control and prevention,” he said.

The last trains left Wuhan the morning of Jan. 23, cutting off a surge of outbound travel that had begun three days earlier, Baidu data shows. Nearby cities rushed to impose travel restrictions of their own. From Jan. 23 to Jan. 26, the 15 cities that Baidu data shows received the most travelers from Wuhan — a combined 70 percent — all imposed some level of travel restrictions.

Other nations soon followed suit, including the United States, Australia, Singapore, New Zealand and the Philippines, all of which have sharply restricted entry for people coming from China. Others, like Italy and Indonesia, have barred flights.

WorldPop researchers found that travel out of Wuhan has historically ramped up in the weeks before Lunar New Year’s Day. Based on historical travel patterns, they identified 18 high-risk cities within China that received the most travelers from Wuhan during this period. They then used 2018 flight itineraries from the International Air Transport Association to map the global connectivity of those cities.

They note that travel patterns after restrictions started rolling out on Jan. 23 will not match historical norms and that the cities they identified are initial ports of landing; travelers could have subsequently moved elsewhere.

The top 10 global destinations for travelers from high-risk Chinese cities around Lunar New Year, according to their analysis, were Thailand, Japan, Hong Kong, Taiwan, South Korea, the US, Malaysia, Singapore, Vietnam and Australia.

In Africa, Egypt, South Africa, Ethiopia, Mauritius, Morocco, Nigeria and Kenya topped the list.

The African continent is particularly vulnerable because of the weaker health infrastructure in many countries, and the longer cases go undetected, the more likely they are to spread.

“Capacity is quite weak in many African health services,” Dr. Michel Yao, emergency operations manager for the World Health Organization in Africa, told the AP. This new virus “could overwhelm health systems we have in Africa.”

The Africa Centers for Disease Control, formed three years ago in response to the Ebola crisis in West Africa, said screening has been stepped up at ports of entry across Africa. Egypt began screening passengers from affected areas in China on Jan. 16. Over the next eight days, Nigeria, Ethiopia, South Africa, Mauritius and Kenya all put screening systems in place. No confirmed cases have been reported.


Businesses win COVID-19 insurance payouts after UK top court ruling

Updated 40 min 55 sec ago

Businesses win COVID-19 insurance payouts after UK top court ruling

LONDON: Small businesses, from restaurants to nightclubs and wedding planners to beauty parlors, have won the right to insurance payouts after Britain’s highest court ruled their policies should cover losses caused by coronavirus lockdowns.
Six of the world’s largest commercial insurers — Hiscox, RSA, QBE, Argenta, Arch and MS Amlin — argued many business interruption policies did not cover widespread disruption after Britain’s first national lockdown last March.
But the UK Supreme Court dismissed appeals by the insurers after scrutinizing non-damage insurance policy clauses — which cover disease, denial of access to business premises and hybrid clauses — in a victory for the regulator and policyholders.
The test case, which has been watched closely overseas, has pitched the industry regulator against major insurance companies since last May and has been expected to affect 370,000 policyholders, 60 insurers and billions of pounds in claims.
Alistair Handyside, executive chair of the Professional Association of Self-Caterers UK, whose members had a policy with RSA, said he was delighted by a judgment that would mean survival for many amid a third lockdown.
But policyholders are now bracing for the next stage in their fight for payouts.
“It would appear we have won another battle 10 months too late,” said Murray Pulman, who runs The Posh Partridge cafe in Dorchester, southwest England.
“The war is not over, however,” he said.
“Getting payment, compensation and costs ... is another whole new fight which begins today.”
Hiscox, MS Amlin, Argenta and RSA said they would be paying claims as soon as possible.
Other insurers were not immediately available for comment. Hiscox estimated its 2020 COVID-19 estimate for business interruption had risen by $48 million net of reinsurance, bringing total claims to £136 million ($185.52 million).
Britain’s Financial Conduct Authority (FCA) said it would work with the industry to ensure they settled claims quickly and made interim payments if possible.
The case turned on business interruption policies with clauses offering cover when insured premises cannot be accessed because of public authority restrictions, in the event of a notifiable disease within a specified radius and hybrid wordings.
Insurers said they were paying valid claims but that they could not provide limitless cover for losses amassed when almost the entire economy was shut down and healthy people consigned to their homes in the most stringent restrictions on public life since World War Two.
London’s High Court ruled last September that some insurers had been wrong to deny cover, prompting six insurers, the FCA and the Hiscox Action Group of policyholders to challenge elements of the ruling they had lost in an appeal that leapfrogged the Court of Appeal because of its critical nature.
Christopher Croft, CEO of insurance brokers’ association LIIBA, said the industry’s reputation had been damaged.
“We need to think hard about how we redress that,” he said.