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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 ...

A diagram of a filamentous RSV virion.

Respiratory syncytial virus (RSV) in Australia – worth not(ify)ing

Posted onAugust 27, 2023August 27, 2023

Once upon a time, we grew viruses from sick patients’ samples. This took an age, failed often, had low throughput and was not a good diagnostic tool. Then we developed Read More …

CategoriesRSV, Testing

Vote Yes in the 2023 voice to Parliament referendum.

I’m voting YES to the Voice to Parliament.

Posted onAugust 8, 2023August 9, 20232 Comments

Because the First Nations people of Australia deserve to have the privileges the rest of us take for granted and, at the very least, be the source of truth on Read More …

CategoriesCommunication

Excess deaths align with COVID-19

Posted onMay 7, 2023May 7, 20232 Comments

There are minimisers who spread misinformation, like butter on hot toast. And yes, it can sink in and spread further. One of these piles of melted fat ridiculously claims that Read More …

CategoriesCOVID-19, Epidemic, Influenza

Variation is key to the SARS-CoV-2 ‘waves’

Posted onMay 7, 2023May 7, 2023

Just a short note to highlight that viruses changing their ‘look’ through selection and expansion of variants in response to our immune system’s pressure on their evolution has been the Read More …

CategoriesCOVID-19, Vaccines & vaccination, VariantsTagsepidemic

person holding injection

The 2023 southern hemisphere influenza vaccine

Posted onApril 29, 2023July 13, 2023

Each year we get a new vaccine for each hemisphere. The design gets settled six months out, and sometimes a lot can change in that time. So how does the Read More …

CategoriesInfluenza, Vaccines & vaccination

young annoyed female freelancer using laptop at home

‘Endemic’ covers a lot of biology, but we’re probably not there yet for COVID-19

Posted onJanuary 2, 2023January 2, 2023

Right up front, I’m going to repeat myself by saying that I think COVID-19 will become a disease that has endemic as well as epidemic states at some point in Read More …

CategoriesCommunication, COVID-19, Endemic, Influenza, Picornavirus, Transmission, VariantsTagsCOVID-19, disease, endemic, influenza, pandemic

Whatever happened to communication?

Posted onJuly 24, 2022July 25, 20222 Comments

I’m not an expert in many things. But I’m enough of a scientist to conclude with confidence that what’s happening now with COVID-19 in Australia and in many other countries Read More …

CategoriesCommunication, COVID-19, Pandemic

Masks matter for more than mandates

Posted onJuly 7, 2022July 1, 20253 Comments

The amount of virus per amount of snot, air, monkey or whatever is a way to describe the concentration of virus present in that thing. It might seem intuitive to Read More …

CategoriesAerosols, COVID-19, Masks, Rhinovirus, SARS-CoV-2TagsInfectious dose, Plaque forming assay, TCID50

An early & big flu rise in Australia

Posted onJune 7, 2022June 8, 2022

Influenza (flu) cases have been rising rapidly in Australia this year. Some see this as a result of waning immunity during our border closures. Some see this as the harbinger Read More …

CategoriesInfluenza

NEXTSTRAIN Clades, 02MAY2022

BA.2.12.1 is on the rise in New York…

Posted onMay 2, 2022May 2, 2022

A recently named sub-strain represents the latest twist in the ongoing evolution of SARS-CoV-2. It’s currently active in the United States and looks to be very capable of spreading, outpacing Read More …

CategoriesCOVID-19, SARS-CoV-2, Variants

Unexplained hepatitis: severe liver inflammation among young children

Posted onApril 25, 2022May 11, 20222 Comments

Uncharacterised and so far rare cases of unexplained severe liver inflammation among young children. These cases of unexplained hepatitis have been appearing in elevated numbers worldwide since November 2021. The Read More …

CategoriesAdenovirus, Emerging disease, SARS-CoV-2, Uncategorized

Lockdowns had a role: they saved lives

Posted onApril 18, 2022April 18, 2022

There are threats and lists and all manner of abuse aimed at those who promoted or supported measures that saved lives during the COVID-19 pandemic. I just want to make Read More …

CategoriesCoronavirus, COVID-19, Pandemic, TransmissionTagsLockdown

Super-cold or a silly headline?

Posted onApril 15, 2022April 17, 2022

In Australia, there seem to be a bunch of articles talking about “super-colds”. Please stop calling them this. They are just colds caused by one or more of the many Read More …

CategoriesCoughs & colds

Arrr a piRATe

Arrrrr on the rise (Rhinovirus, RSV and RATs)

Posted onMarch 19, 2022March 26, 2022

Anecdotally there are a lot of acute respiratory virus infections ripping through the community where I live. Particularly noticeable in schools but also workplaces. Yes, there is SARS-CoV-2 among these Read More …

CategoriesRhinovirus, SARS-CoV-2, Transmission

Thank goodness we did all the work

Posted onJanuary 29, 2022July 16, 20226 Comments

Thank goodness we didn’t hold off on opening up to see what Omicron was capable of. We had to have Christmas. And there were national cabinet agreements. Anyway, how could Read More …

CategoriesAerosols, Communication, Coronavirus, COVID-19, Editorial, Enterovirus, Influenza, Parechovirus, Rhinovirus, SARS-CoV-2, Transmission

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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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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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