David Dowdy Profile picture
Sep 14, 2020 7 tweets 2 min read Read on X
If there were 5 take-home messages for the public regarding the epidemiology of the pandemic, what would they be? I've taken a stab below, but would welcome others' thoughts. While it's important to get the details right, it's also important not to lose the forest for the trees.
1. We're less than halfway through.
Even in the best-case scenario of an effective and safe vaccine available in a few months, it will take much longer to distribute, deliver, and change public opinion.
2. We can't just go back to normal.
Even if herd immunity is starting to have an effect, this effect is being maintained by behavior change - no large gatherings, wearing masks, social distancing, etc. If contact patterns return to pre-pandemic levels, it will be deadly.
3. Each of us can still make a big difference.
Nearly everyone on the planet still has loved ones who are at increased risk of COVID death. Every day that each of us minimizes our own risk of infection and transmission - and therefore protects the ones we love - is a success.
4. The pandemic isn't fair.
The people suffering the most from this disease are the ones working the hardest to keep the rest of us safe and those who are struggling (financially, societally, caring for kids/parents, etc). Those of us who are more fortunate must remember this.
5. We will win this war.
Our immune systems are designed to fight viruses like this. After >6 months, reinfection is very rare and usually mild. Population immunity will occur. In 5 years, COVID will not be a top-10 cause of death. It may take time, but we will beat this virus.
Meaning, in summary:
"We have a long way to go (1), but we need to keep our guard up (2) to protect our loved ones (3) and support those who are less fortunate (4) - knowing that, if we keep it up, we will ultimately succeed (5)."

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More from @davidwdowdy

Jul 8, 2022
Over half of all COVID infections in the US are now BA.5.

3 reasons why this isn't as alarming as it might seem:
- Rise in BA.5 has been gradual.
- Our immune systems are better prepared.
- Places hit first by the current wave have stabilized.

Some reasons for COVID optimism:
Gradual rise:

Whereas Omicron fully established itself in 1 month, BA.5 has taken 2 months to get to 50%.

And the size of the wave has been much smaller.

Meaning that any advantage BA.5 has over other subvariants is very small, compared to the advantage Omicron had over Delta.
Viruses evolve. But our immune systems also adapt.

One can always focus on the virus for bad news. But the overall trend is good news.

Apr-June 2022 was the least deadly 3-month period since the pandemic started. Even as transmission (e.g., test positivity, orange) has risen.
Read 8 tweets
Feb 25, 2022
New COVID guidance from CDC is out:


Now setting three "community levels". Previously based on cases + test positivity, now cases + new COVID admissions + % of hosp beds occupied by COVID.

A quick hot-take🧵on pros and cons of this approach.
Pro: It uses science.

This was based on measures that most accurately predicted deaths & ICU use in 3 weeks. Far better than arbitrary goals.
Pro: Test positivity was dropped.

% of tests positive is no longer a meaningful indicator, as testing varies so widely from one location to the next, and many tests are at-home tests that are difficult to track.
Read 10 tweets
Feb 11, 2022
What will COVID look like in 2022?

Nobody knows for sure, but here's my take on the 3 most likely scenarios.

Each with reasons why that scenario might (and might not) happen.

Take home: Depends on how long & strong immunity is, w/ most people now vax'd/infected multiple times.
Scenario A: 2022 is great.

COVID levels stay very low, at least until winter. Then we boost w/ COVID + flu vax.

Why so?
- Most people now have multiple doses of immunity (vax or infection).
- Many cases could be asymptomatic.
- Europe saw this in 2020 w much less immunity.
Why not Scenario A?
- Most countries haven't gone this long w/o a wave (or very stringent restrictions).
- Immunity vs infection doesn't seem to last that long: four vax doses haven't prevented a wave in Israel.
- Betting against the virus has not been smart so far.
Read 8 tweets
Feb 3, 2022
Some students have asked me: "If I want to engage w the press in my future job, what should I learn to do?"

Here's my top 10 list of responses to this question.

Bottom line: it's not about how smart you are.

Would welcome comments on this list from my journalist colleagues!
1. Treat journalists as allies, not adversaries.

Some scientists think journalists are looking for missteps that can be misquoted.

In my experience, this is not true. Journalists want to get the story right as much as we do.

Practice interviewing as friendly conversation.
2. Do your homework.

Don't go into an interview without asking what the story is about.

Spend a few minutes making sure your numbers are right. (I often keep tabs/notes open for reference.)

Think about the 2-3 key points you want to make, so you can make them repeatedly.
Read 11 tweets
Jan 24, 2022
Now that we've been living with Omicron for 2 months, we can use this wave to learn some lessons about
COVID in general.

First: This virus likely depends on a core group of people/settings for its spread.

We can surmise this by looking at the decline of Delta.
If 1 in 3 Omicron cases is reported, the # of cases in the US now is similar to # vax'd per day in April.

Yet Delta is falling much faster today (in winter) than cases were in April.

Why? Likely Omicron (unlike vax) is infecting the people who otherwise would transmit Delta.
And Omicron-induced immunity nearly wiped out Delta - at a time when <5% of the population had been infected w Omicron.

Meaning that a small fraction of people (those most likely to get infected & transmit) and settings
(large outbreak-prone gatherings) are sustaining spread.
Read 8 tweets
Jan 18, 2022
Though guilty myself, I wish we would stop naming waves according to variant ("delta wave", "omicron wave", etc).

This makes it seem like each wave is randomly triggered by a new variant - and there's nothing we can do about it.

But in reality, we are making a lot of progress.
Each wave can be explained by a combination of behavior change, winter effect, and immunity. Without invoking variants.

And though waning immunity has played a role so far, our overall immunity is building w time. (Why the average case now is milder than early in the pandemic.)
As shown below, we were able to live more freely in 2021. Largely because of vax/immunity.

This most recent wave isn't over - and we need to act w caution until it is.

But we are not at the mercy of each new variant. Though we're all tired, things should get better soon.
Read 4 tweets

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