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Jason Haw (黃傑順) Profile picture
Jason Haw (黃傑順)
@jasonhaw_
PhD Epidemiology Candidate @JohnsHopkinsEPI, MHS Biostatistics student @jhubiostat | MS @GlobalHealthGU | Politics, public health, pop culture | 🇵🇭🇹🇼
Apr 16, 2021 • 12 tweets • 3 min read
Given that we are seeing a rise in deaths, I want to clarify again a very important point about measuring case-fatality rate in an ongoing pandemic: DON'T DO IT. RESIST THIS DEBATE.

It may look like a "simple" division of deaths over cases but it is very complicated. A thread: 1/ Let's start with the denominator: cases. What do we count exactly? Just the confirmed cases? Our testing capacity is far from ideal, so our surveillance systems continue to underreport confirmed cases. How much underreporting depends on a number of factors.
Apr 4, 2021 • 22 tweets • 4 min read
I appreciate the painstaking work here collating LGU-reported values and comparing them vs national.

In this thread, I will explain how difficult it is.

I'll also answer the question why DOH is taking forever to count deaths when our Facebook feeds are doing a better job at it 1/ Because epidemiological surveillance is highly decentralized under Republic Act 11332, LGUs have their own process of validating which cases belong to their jurisdiction, and what time their cutoffs are daily for public reporting. It's completely separate from DOH's processes.
Mar 14, 2021 • 11 tweets • 2 min read
It's going to be difficult to determine whether the surge we are seeing in cases is driven by a variant (whether it's B.1.1.7, B.1.351, P.3, or P.1) but there are some key differences in the country's surveillance capacity between the July/Aug surge and the one happening now 1/ The narrative last July/Aug was that the government was struggling to expand laboratory capacity. Mayors and senators were posturing how they were ready with their labs but DOH regulatory bodies were taking forever to inspect and approve. Now, labs have been underutilized.
Mar 12, 2021 • 7 tweets • 2 min read
Over the past year, I have been getting a lot of invites to speak or interviews from students.

All invitations have become virtual and I realize a lot of students are not properly trained in proper email etiquette.

Here are some basic rules to live by: 1/ Learn how to write a business letter. There's tons of examples online.

Be clear about the intent of the letter, and take the perspective of the recipient. What do you want the recipient to do? I've gotten emails where the invitation was not clear of what was expected of me.
Dec 30, 2020 • 8 tweets • 3 min read
1/ One of the most surprising provisions in the Universal Health Care Act passed last year was a mandatory increase of PhilHealth contributions among the formally employed. It has always been unpopular to raise premiums, so I was surprised how Congress got away w/ the 6-year hike Image 2/ There's actually no mechanism in the law to delay the increases in premiums, just a guarantee from PhilHealth that every year, there will be increases in benefits. That may mean more health interventions covered, or increases in financial coverage of existing benefits.