KEYWORDS | By Christopher Mims 

Outside the rural Guinean village where the current Ebola outbreak apparently began, a pictographic billboard illustrates how to avoid the disease. This is--along with radio, which remains an important source of news for people in West Africa--the state of the art for reaching mostly illiterate villagers.

Contrast Guinea with Nigeria, which despite 19 diagnosed cases of Ebola beginning in July, is now free of the disease. Nigeria has almost six times the GDP per capita of Guinea, and more resources always helps when the best way to stop the spread of a disease is quarantine and vigilance by medical professionals.

But Nigeria had another tool Guinea lacks: cellphone companies that were willing to give up the call-data records of some of the infected patients. Almost all cell carriers know where the phones they service are at all times, to varying degrees of spatial resolution. When you need to know where someone has been in the past month--to determine every person with whom they have been in contact--there is no better way than to track his or her cellphone.

Ivory Coast, richer still than Nigeria and so far Ebola-free, is capitalizing on the mobile connectivity of its citizens by sending out millions of mass text messages warning about the dangers of Ebola and how to avoid catching it. Smartphone penetration is still low in Africa relative to the rest of the world--in Ivory Coast around 25% of all mobile phones are smartphones, while 90% of households have access to a mobile phone.

I asked Nnenna Nwakanma, a resident of Ivory Coast whose work at the World Wide Web Foundation focuses on making Internet access more affordable, whether access to the mobile Internet--pretty much the only kind there is in most of Africa--could have an impact on the spread of Ebola. She was unequivocal. "For us in Africa, connectivity is a life and death issue," she said.

Researchers I spoke to were more specific.

Linus Bengtsson, creator of software called Flowminder, which provides maps of travel patterns in affected areas, said more phones and more connectivity would improve his models of where Ebola could pop up next. Emmanuel Letouzé, director of the Data-Pop Alliance, which uses data to aid recovery from natural disasters, said the better data that would follow from more phones and more connectivity would allow researchers to determine which kinds of public interventions and communications work best to slow the spread of an epidemic.

In Sierra Leone, a system called Tera has been used by the American Red Cross to send text messages to every cellphone in areas at risk for Ebola. If you've ever received an Amber Alert about a missing child on your smartphone you've experienced something akin to what cellphone users in West Africa are now receiving.

And the more sophisticated the phone, the better--smartphones with multiple radios, such as Wi-Fi and GPS in addition to cellular, are much better at identifying their precise location than simple feature phones. Smartphones also give their users more channels through which to receive news about outbreaks, such as access to the BBC's Ebola news service via the Facebook-owned chat app WhatsApp.

Here's where Google and Facebook, and more important the nonprofits they sponsor, come in. The Alliance for Affordable Internet, of which Google is a primary sponsor, works on breaking down policy and regulatory barriers to affordable Internet access.

In Nigeria the average smartphone user has to spend 13% of his or her monthly salary for 500 megabytes of data a day. The same amount of data in Liberia, one of the three countries hit hard by Ebola, would cost more than the average person's monthly salary. The story is much the same in Guinea and Sierra Leone.

Facebook's nonprofit Internet.org has goals similar to the Alliance for Affordable Internet, but Facebook and Google aren't relying solely on local operators to solve the problem of how to connect the five billion people who aren't online. Google is experimenting with low-flying balloons that would act as cell towers in the sky, and Facebook is working on giant solar-powered drones that would accomplish the same.

Both of these efforts have been greeted with some cynicism by critics in the West--can we trust companies that are reliant for their growth on getting more people online to do so in a way that isn't mostly about their bottom line?

But in the poorest countries in Africa, where people simply cannot afford connectivity of any kind, and where 10,000 cases of Ebola have just been confirmed by World Health Organization, which company reaps profits from bringing more people online seems morally insignificant next to the possibility that doing so will help stop the spread of future outbreaks of Ebola and other diseases.

Thus when Mark Zuckerberg declares connectivity to be a "human right," I don't find him the least bit disingenuous. Getting people online is an imperative--and if it means Facebook profits from it, so be it.

It is important to remember that Ebola, which scientists believe emerged 20 million years ago, is going to come back again and again. Because of its great age, experts say it may even have cousins, other lethal viruses just waiting to make the jump to humans. And malaria, which epidemiologists have also had success in fighting with better information gathering and dissemination tools, still kills more than 600,000 people a year.

If we want to stop the next pandemic, connecting the world's poorest to the most effective communication method ever invented is a good place to start.

Follow Christopher Mims on Twitter

@Mims

and write to him at

christopher.mims@wsj.com

.

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