比爾蓋茲(Bill Gates)指出COVID-19病毒像是百年難得一見的超級病原體，不只危害健康的成年人，而且傳播力強，加上能從輕症或無症狀者傳播，在防疫上帶來一定程度得威脅。中央與地方政府和公共衛生學者面對新冠肺炎的威脅，是必須提升防疫措施， 以減緩COVID-19病毒的傳播。而給予開發中國家協助，應可減緩COVID-19病毒於國際間迅速傳播；此外也要加速抗病毒藥物和疫苗的研發，預估今年六月就有新冠肺炎疫苗可施打。而要能有效減緩新冠肺炎傳播，強化開發中國家基層照護系統尤其重要，加速抗病毒藥物和疫苗的開發，需投入大量的經費並加強國際合作，這些挑戰均須克服，才能避免COVID-19病毒於國際間繼續蔓延。 另外政府、民間和產業須達成共識，讓抗病毒藥物能及時治療新冠肺炎病例，疫苗能及時給予民眾施打，在危機發生時領導者的兩大首要責任：解決立即問題、避免此問題再次發生，在面對新冠肺炎疫情可能全球大流行的威脅，應當立即採取行動刻不容緩。
In any crisis, leaders have two equally important responsibilities: solve the immediate problem and keep it from happening again. The Covid-19 pandemic is a case in point. We need to save lives now while also improving the way we respond to outbreaks in general. The first point is more pressing, but the second has crucial long-term consequences.
The long-term challenge — improving our ability to respond to outbreaks — isn’t new. Global health experts have been saying for years that another pandemic whose speed and severity rivaled those of the 1918 influenza epidemic was a matter not of if but of when.1 The Bill and Melinda Gates Foundation has committed substantial resources in recent years to helping the world prepare for such a scenario.
Now we also face an immediate crisis. In the past week, Covid-19 has started behaving a lot like the once-in-a-century pathogen we’ve been worried about. I hope it’s not that bad, but we should assume it will be until we know otherwise.
There are two reasons that Covid-19 is such a threat. First, it can kill healthy adults in addition to elderly people with existing health problems. The data so far suggest that the virus has a case fatality risk around 1%; this rate would make it many times more severe than typical seasonal influenza, putting it somewhere between the 1957 influenza pandemic (0.6%) and the 1918 influenza pandemic (2%).2
Second, Covid-19 is transmitted quite efficiently. The average infected person spreads the disease to two or three others — an exponential rate of increase. There is also strong evidence that it can be transmitted by people who are just mildly ill or even presymptomatic.3 That means Covid-19 will be much harder to contain than the Middle East respiratory syndrome or severe acute respiratory syndrome (SARS), which were spread much less efficiently and only by symptomatic people. In fact, Covid-19 has already caused 10 times as many cases as SARS in a quarter of the time.
National, state, and local governments and public health agencies can take steps over the next few weeks to slow the virus’s spread. For example, in addition to helping their own citizens respond, donor governments can help low- and middle-income countries (LMICs) prepare for this pandemic.4 Many LMIC health systems are already stretched thin, and a pathogen like the coronavirus can quickly overwhelm them. And poorer countries have little political or economic leverage, given wealthier countries’ natural desire to put their own people first.
By helping African and South Asian countries get ready now, we can save lives and slow the global circulation of the virus. (A substantial portion of the commitment Melinda and I recently made to help kickstart the global response to Covid-19 — which could total up to $100 million — is focused on LMICs.)
The world also needs to accelerate work on treatments and vaccines for Covid-19.5 Scientists sequenced the genome of the virus and developed several promising vaccine candidates in a matter of days, and the Coalition for Epidemic Preparedness Innovations is already preparing up to eight promising vaccine candidates for clinical trials. If some of these vaccines prove safe and effective in animal models, they could be ready for larger-scale trials as early as June. Drug discovery can also be accelerated by drawing on libraries of compounds that have already been tested for safety and by applying new screening techniques, including machine learning, to identify antivirals that could be ready for large-scale clinical trials within weeks.
All these steps would help address the current crisis. But we also need to make larger systemic changes so we can respond more efficiently and effectively when the next epidemic arrives.
It’s essential to help LMICs strengthen their primary health care systems. When you build a health clinic, you’re also creating part of the infrastructure for fighting epidemics. Trained health care workers not only deliver vaccines; they can also monitor disease patterns, serving as part of the early warning systems that alert the world to potential outbreaks.
We also need to invest in disease surveillance, including a case database that is instantly accessible to relevant organizations, and rules requiring countries to share information. Governments should have access to lists of trained personnel, from local leaders to global experts, who are prepared to deal with an epidemic immediately, as well as lists of supplies to be stockpiled or redirected in an emergency.
In addition, we need to build a system that can develop safe, effective vaccines and antivirals, get them approved, and deliver billions of doses within a few months after the discovery of a fast-moving pathogen. That’s a tough challenge that presents technical, diplomatic, and budgetary obstacles, as well as demanding partnership between the public and private sectors. But all these obstacles can be overcome.
One of the main technical challenges for vaccines is to improve on the old ways of manufacturing proteins, which are too slow for responding to an epidemic. We need to develop platforms that are predictably safe, so regulatory reviews can happen quickly, and that make it easy for manufacturers to produce doses at low cost on a massive scale. For antivirals, we need an organized system to screen existing treatments and candidate molecules in a swift and standardized manner.
Another technical challenge involves constructs based on nucleic acids. These constructs can be produced within hours after a virus’s genome has been sequenced; now we need to find ways to produce them at scale.
Beyond these technical solutions, we’ll need diplomatic efforts to drive international collaboration and data sharing. Developing antivirals and vaccines involves massive clinical trials and licensing agreements that would cross national borders. We should make the most of global forums that can help achieve consensus on research priorities and trial protocols so that promising vaccine and antiviral candidates can move quickly through this process. These platforms include the World Health Organization R&D Blueprint, the International Severe Acute Respiratory and Emerging Infection Consortium trial network, and the Global Research Collaboration for Infectious Disease Preparedness. The goal of this work should be to get conclusive clinical trial results and regulatory approval in 3 months or less, without compromising patients’ safety.
Then there’s the question of funding. Budgets for these efforts need to be expanded several times over. Billions more dollars are needed to complete phase 3 trials and secure regulatory approval for coronavirus vaccines, and still more funding will be needed to improve disease surveillance and response.
Government funding is needed because pandemic products are extraordinarily high-risk investments; public funding will minimize risk for pharmaceutical companies and get them to jump in with both feet. In addition, governments and other donors will need to fund — as a global public good — manufacturing facilities that can generate a vaccine supply in a matter of weeks. These facilities can make vaccines for routine immunization programs in normal times and be quickly refitted for production during a pandemic. Finally, governments will need to finance the procurement and distribution of vaccines to the populations that need them.
Billions of dollars for antipandemic efforts is a lot of money. But that’s the scale of investment required to solve the problem. And given the economic pain that an epidemic can impose — we’re already seeing how Covid-19 can disrupt supply chains and stock markets, not to mention people’s lives — it will be a bargain.
Finally, governments and industry will need to come to an agreement: during a pandemic, vaccines and antivirals can’t simply be sold to the highest bidder. They should be available and affordable for people who are at the heart of the outbreak and in greatest need. Not only is such distribution the right thing to do, it’s also the right strategy for short-circuiting transmission and preventing future pandemics.
These are the actions that leaders should be taking now. There is no time to waste.