logo
episode-header-image
Jan 2023
21m 19s

Uppsala Reports Long Reads – Unmasking d...

Uppsala Monitoring Centre
About this episode

Most pharmacovigilance professionals will have heard of masking – a statistical issue where reports for one drug hide signals for other drugs. But the problem gained fresh attention when record amounts of reports began piling up for the COVID-19 vaccines. How should we be unmasking data in the COVID-19 vaccine era?

This episode is part of the Uppsala Reports Long Reads series – the most topical stories from UMC’s pharmacovigilance magazine, brought to you in audio format. Find the original article here.

After the read, we speak to data scientist Sara Vidlin, who authored the article, to learn more about masking and how to deal with it.

Tune in to find out: 

  • How masking evolves with the data 
  • Which methods can be used to unmask data 
  • What other pitfalls to watch out for when performing quantitative analyses

Want to know more?

In the very beginning of the vaccine rollout, the USA FDA observed how early signals for COVID-19 vaccines were delayed because of other drugs masking them, highlighting how masking is not a static phenomenon.

In 2013, Uppsala Monitoring Centre developed a simple strategy to uncover masking by identifying and removing influential outliers.

Join the conversation on social media
Follow us on Twitter, Facebook or LinkedIn and share your thoughts about the show with the hashtag #DrugSafetyMatters.

Got a story to share?
We’re always looking for new content and interesting people to interview. If you have a great idea for a show, get in touch!

About UMC
Read more about Uppsala Monitoring Centre and how we work to advance medicines safety.

Up next
Jun 19
#38 Patient perspectives in PV: a fireside chat at the ISoP Mid-Year Symposium
This special episode was recorded at the mid-year symposium of the International Society of Pharmacovigilance (ISoP), 14–15 May 2025. Held in Uppsala, Sweden, the theme of the symposium was Improving information capture for safer use of medicines. The episode is an abridged recor ... Show More
34m 44s
May 28
#37 Beyond numbers: quality in ADR reporting – Henry Zakumumpa
Spontaneous adverse event reporting from healthcare professionals and patients is a cornerstone in pharmacovigilance systems. Unfortunately, it is a well-known issue that only a fraction of events is reported. To further complicate matters, poor quality reports present a signific ... Show More
38m 49s
Mar 2025
#36 Pregnancy-related pharmacovigilance – Levente Pápai, Lovisa Sandberg & Sara Vidlin
There are many reasons why use of medical products during pregnancy requires special attention. First and foremost, we want to be sure that the medicine is as safe as possible for both the pregnant person and the unborn child. Unfortunately, the safety profiles of medicines used ... Show More
36m 44s
Recommended Episodes
Apr 2021
Vaccine passports, explained | Recode Daily
One way that America can get “back to normal” is through what's called a digital vaccine passport. America is well underway with its covid vaccination rollout and while we still have a long way to go, more and more people are getting vaccinated. But while carrying a digital vacci ... Show More
8m 28s
Apr 15
Ep 173 Childhood Vaccine Schedule 2: Who’s making the call?
After last week’s episode, we all know about each of the diseases that we’re protected against thanks to our childhood vaccine schedule here in the US. And after this week’s episode, we’ll understand more about the schedule itself - why it might look different from other schedule ... Show More
57m 12s
Apr 8
Ep 172 Childhood Vaccine Schedule 1: Let’s give it a shot
We’re already back with our first episode of season 8! This week and next, we’re exploring childhood vaccine schedules - what diseases they protect us from, how the schedule is arranged, and who decides on the vaccines to include and the timing of vaccinations. In this first epis ... Show More
1h 7m
Jul 4
Audio long read: How to speak to a vaccine sceptic — research reveals what works
Questions and doubts about vaccines are on the rise worldwide and public-health specialists worry that these trends could worsen. But while the shift in public attitudes towards immunizations can leave scientists, physicians and many others feeling disheartened, a surge of resear ... Show More
16m 13s
Dec 2020
CDC Vaccine Chief: No Corners Cut
Dr. Nancy Messonnier leads the Centers for Disease Control and Prevention’s work to safely vaccinate the country. Whether the question is who to vaccine first, how to restore trust, or how to administer two doses of a vaccine stored at -70 degrees to a nation of 328 million peopl ... Show More
23m 39s
May 13
Special Episode: Dr. Adam Ratner & Booster Shots
For the past few months, measles has been in regular rotation in the news cycle here in the US, with outbreaks occurring across the country in regions with low vaccine uptake. These outbreaks represent a worrying trend in the rejection of scientific and medical expertise, with lo ... Show More
52m 32s
Jun 2
Megalodon Diets, Teeth Sensitivity and a Bunch of Vaccine News
The measles outbreak in West Texas is slowing. Health officials think an increase in vaccination rates contributed to the slowdown, but Texas lawmakers have pushed a new bill to make it even quicker and easier for parents to exempt their children from vaccines. The Centers for Di ... Show More
8 m
Dec 2024
Follow the White Rabbit(s): The 256th Evolutionary Lens with Bret Weinstein and Heather Heying
In this 256th in a series of live discussions with Bret Weinstein and Heather Heying (both PhDs in Biology), we talk about the state of the world through an evolutionary lens. In this week’s episode, we discuss resistance to Make America Healthy Again, and how beliefs that were o ... Show More
2h 1m
Mar 2025
The Growing Danger of Measles
A measles outbreak continues to spread in Texas. More than 200 people have been infected. One child has died. And health experts are now concerned that low vaccination rates will make it harder to contain.Teddy Rosenbluth, a health reporter at The New York Times, explains the rap ... Show More
26m 2s
Jun 3
Information Inoculation: Defending Against Medical Myths: Why we need to fight misinformation about vaccines | Ethan Lindenberger
Ethan Lindenberger never got vaccinated as a kid. So one day, he went on Reddit and asked a simple question: "Where do I go to get vaccinated?" The post went viral, landing Lindenberger in the middle of a heated debate about vaccination and, ultimately, in front of a US Senate co ... Show More
44m 23s