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Virology Down Under

Facts, data, info, expert opinion and a reasonable, occasionally grumpy, voice on viruses: what they are, how they tick and the illnesses they may cause.

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Age and COVID-19: What’s with all the young kids?

Age and COVID-19: What’s with all the young kids?

Inspired by an online conversation and the hard work of others, I set off to examine age groupings among Australians confirmed as COVID-19 cases, based on testing using a quality-laboratory Read More ...

Another way to look at flu season size

Another way to look at flu season size

Peak height, number of cases, deaths, severity – these are all terms that are used to give you an idea of how big a flu season has been. Here’s another Read More ...

The “Infection Pause”: because it’s about fewer infections, not an immune debt to repay

The “Infection Pause”: because it’s about fewer infections, not an immune debt to repay

There was a real, measurable shift in the peak season for several endemic human pathogens as well as a rebound in infections, coinfections, and disease severity among them after the Read More ...

Asymptomatic, acute and persistent COVID-19 symptom changes over the course of three infections

Asymptomatic, acute and persistent COVID-19 symptom changes over the course of three infections

Data from a UK healthcare worker cohort published in 2024 examined how signs and symptoms of COVID-19 changed after 1, 2, or 3 SARS-CoV-2 lab-confirmed infections. Those with no symptoms Read More ...

China +2

Posted onJanuary 16, 2020January 21, 2020

Two countries, in addition to China, have now had visits from the novel Wuhan coronavirus, detected in travellers with respiratory symptoms. Thailand and Japan have each reported a case and Read More …

CategoriesCluster, outbreak, emergence, Coronavirus, Virus discoveryTagsChina, Japan, pneumonia, Thailand, Wuhan

Some human-to-human transmission isn't surprising in Wuhan

Posted onJanuary 16, 2020January 16, 20204 Comments

A couple of people have asked me lately if they should be worried about the novel Wuhan coronavirus. Which got me to thinking. Much of what we sciencey types chat Read More …

CategoriesCluster, outbreak, emergence, Coronavirus, Virus discoveryTagspneumonia, Wuhan

Viral pneumonia cluster in Wuhan, central China: 44 cases and counting

Posted onJanuary 3, 2020December 31, 20215 Comments

Welcome to 2020 in which we already have reports of our first cluster of viral-pneumonia-of-unknown-cause cases, generating worldwide media and evoking memories of the sudden acute respiratory syndrome (SARS) coronavirus Read More …

CategoriesCluster, outbreak, emergence, Laboratory methods, Virus discoveryTagsChina, Hubei, Viral pneumonia, Wuhan

There are plenty of placebo-controlled vaccine trials

Posted onDecember 31, 2019September 22, 202011 Comments

The agglomeration of anti-vaxxers love to plague us with their pro-disease perfidy. They really enjoy wheeling out the lie that vaccines have never been tested with a placebo. Turns out, Read More …

CategoriesDebunking, Vaccines & vaccinationTagsPlacebo

Measles in Samoa – a couple of referenced facts

Posted onDecember 30, 2019March 4, 20253 Comments

Measles has killed 81 people in Samoa so far, mostly children. Meanwhile, like a pack of hyenas laughing maniacally off stage, the anti-vaccination cult is drooling over the harm and Read More …

CategoriesDebunking, Measles

Measles has peaked in Samoa…

Posted onDecember 11, 2019December 27, 20192 Comments

In one of the most satisfying graphs I’ve ever made, this plot of weekly measles cases – both suspected and confirmed (the minority) – shows that the epidemic of measles Read More …

CategoriesMeasles, Vaccines & vaccinationTagsSamoa

Anti-vaxxers hate your children

Posted onNovember 27, 2019December 1, 201912 Comments

What is happening in Samoa is exactly what science and history tell us to expect when the measles virus is introduced into a population with low immunity. Sick, hospitalised, immune-damaged Read More …

CategoriesEditorial, Vaccines & vaccinationTagsanti-vaccination, Samoa

An early look at influenza in the US highlights that the south does not predict the north

Posted onNovember 24, 2019November 24, 20191 Comment

Influenza (flu) hit Australia earlier in 2019 than it had for many years. It reached a very high peak of cases and the flu season lasted for longer than usual. Read More …

CategoriesInfluenzaTagsepidemiology, United States of America

Buy a gift with real impact this year

Posted onNovember 19, 2019November 25, 2019

Hi All. This is just a small festive season appeal to you. Please consider spending a few dollars on those in need of our support in the lead-up to the Read More …

CategoriesUncategorized

H3N2 is 50 years old and still going strong

Posted onNovember 19, 2019November 19, 20191 Comment

The highly variable H3N2 influenza viruses which seem to cause us the most trouble, heartache and headlines have only been with us since 1968. These tiny droplets of dread emerged Read More …

CategoriesInfluenza, Vaccines & vaccinationTagsA/H3N2, drift, Immunology, Imprinting

Measles in the Pacific via travel from New Zealand

Posted onOctober 25, 2019October 25, 2019

Below are some of the latest numbers around the epidemic of measles in New Zealand, and the outbreaks in Australia which are currently linked to New Zealand via infected travellers. Read More …

CategoriesMeaslesTagsNew Zealand

Flu B viruses: why not H-something-N-something?

Posted onOctober 1, 2019October 1, 2019

The world of influenza (Flu) is filled with many strange things. One of these is why we label the influenza A (FluA) viruses with an “H” (short for the name Read More …

CategoriesInfluenzaTagsFluB, FluC, FLUCV, FLUDV, IFDV, influenza D virus

The reality of vaccination success…

Posted onSeptember 23, 2019September 23, 20191 Comment

Perhaps we all forget just how well vaccines have protected us over the decades. Here’s a reminder! Vaccination success is not something we keep in front of mind because it’s Read More …

CategoriesVaccines & vaccinationTagsImmunisation

Flu in a ScienceWeek flash 🏃

Posted onSeptember 11, 2019September 17, 2019

I was asked to present a talk for science week 2019. I thought an explanation of the unprecedented 2019 influenza (flu) season (nicknamed flunami) would be a good talk. But Read More …

CategoriesInfluenzaTagsEiC

Could Measles virus and Ebola virus be working together in the DRC?

Posted onSeptember 7, 2019September 9, 20192 Comments

Measles, resulting from measles virus (MeV) infection can cause immune suppression and “immune amnesia”. MeV infection most often affects non-immune children but can occur in any age group. Immune suppression Read More …

CategoriesEbola virus, Measles, Vaccines & vaccination

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Recent Posts

  • Age and COVID-19: What’s with all the young kids? April 14, 2026
  • Asymptomatic, acute and persistent COVID-19 symptom changes over the course of three infections March 5, 2026
  • How are asymptomatic COVID-19 cases tracking? March 2, 2026
  • Another way to look at flu season size February 28, 2026
  • Whooping cough in 2024 was huge in Australia, but is declining in 2025 and 2026 February 19, 2026
  • Pathology lab PCR is not research lab PCR January 27, 2026
  • Is there more flu in Australia and New Zealand than normal for Christmas? Hell Yes! December 27, 2025
  • Catch them all? There are three different influenza viruses and they can co-circulate each season August 22, 2025
  • The “Infection Pause”: because it’s about fewer infections, not an immune debt to repay July 31, 2025
  • A Flunami in July July 27, 2025
  • COVID-19 is a Pandemic: What if it was a Pandemic Emergency? And what are they anyway? July 24, 2025
  • In Australia, COVID-19 deaths did decrease between 2023 and 2024, but it’s still a major killer. July 2, 2025
  • Flu down under is a July thing June 16, 2025
  • Q fever – an old zoonosis with a better diagnosis June 9, 2025
  • What if Harvard loses? April 19, 2025

All opinions are my own and do not represent medical advice or the views of any institution.

All graphics made by me are free-to-use. Please just cite the particular page, blog and me. A heads-up would be nice, but that can happen later.

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Regular reads…

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  • Kai Kupferschmidt
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Recent Posts

  • Age and COVID-19: What’s with all the young kids?
  • Asymptomatic, acute and persistent COVID-19 symptom changes over the course of three infections
  • How are asymptomatic COVID-19 cases tracking?
  • Another way to look at flu season size
  • Whooping cough in 2024 was huge in Australia, but is declining in 2025 and 2026

All opinions are my own and do not represent medical advice or the views of any institution.

All graphics made by me are free-to-use. Please just cite the particular page, blog and me. A heads-up would be nice too but that can happen later.

Bluesky: @mackayim.bsky.social

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Virology Down Under

Facts, data, info, expert opinion and a reasonable, occasionally grumpy, voice on viruses: what they are, how they tick and the illnesses they may cause.

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