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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 ...

How many common cold viruses in one place, in one season?

Posted onSeptember 2, 2018September 22, 20203 Comments

I was recently asked how many common cold viruses are among us at a given time? The short answer is – dozens!  In the past, I’ve written a few reviews (for Read More …

CategoriesRhinovirusTagscommon cold, epidemiology, genotype, molecular epidemiology, PCR, rhinovirus

During the first 4 weeks of life “common cold” viruses occur frequently and can make your little one sick….

Posted onAugust 31, 2018May 19, 2019

Not much is known about the number of, and the burden due to, virus infections that happen during the very first four weeks of life – called the “neonatal period“. Read More …

CategoriesRhinovirusTagscommunity cohort, ORChID, respiratory virus, rhinovirus

Only effective vaccines can protect us from respiratory viruses because we’re us

Posted onAugust 24, 2018August 25, 2018

As winter wraps up in Australia, it’s become quite clear that – barring a very unusual late burst of activity – the 2018 influenza (flu) season has passed Australia by with Read More …

CategoriesInfluenza, RhinovirusTagscommon cold, epidemic, Flu, household, influenza, outbreak, pandemic, respiratory viruses, vaccine

Flu is giving Australia a breather….

Posted onAugust 21, 2018August 25, 2018

August is the traditional Australian peak influenza (flu) month. The peak can move around a bit but it usually flu virus party time, followed in size by September. We’re two-thirds of Read More …

CategoriesInfluenzaTagsepidemiology, influenza, lab testing, molecular epidemiology

Minding the gap: looking at numbers early in an outbreak

Posted onAugust 15, 2018August 25, 20182 Comments

The second Ebola virus disease for 2018 continues to unfold in the Democratic Republic of the Congo. Nearly two weeks have passed since the official announcement of the outbreak by the Read More …

CategoriesEbola virusTagsControl gap, Democratic Republic of the Congo, DRC, Ebola virus, Ebola virus disease, epidemiology, Equateur Province, EVD, Ituri Province, North Kivu Province

SNAPDATE: Ebola virus numbers

Posted onAugust 8, 2018August 25, 2018

The latest Ebola virus disease (EVD) figures of the Democratic Republic of the Congo’s (DRC) Ministry of Health (MOH) are out and I’ve plotted them below. The important numbers remain Read More …

CategoriesEbola virusTagsDemocratic Republic of the Congo, DRC, Ebola virus disease, EVD, Hypsignathus monstrosus, Update

The proportion of fatal cases (PFC)…

Posted onAugust 6, 2018August 25, 2018

In July 2013 I coined an initialism for Virology Down Under (VDU) to avoid using the term Case Fatality Ratio/Rate/Risk (CFR); the Proportion of Fatal Cases (PFC). IMPORTED POST* I use Read More …

CategoriesEbola virus, H7N9Tagsimported, PFC, proportion of fatal cases

Ebola virus disease numbers from a double-province outbreak

Posted onAugust 5, 2018August 6, 20182 Comments

In spectacularly rapid fashion, the Democratic Republic of the Congo’s Ministry of Health (MOH) has started it’s daily, very detailed, Ebola virus disease updates to cover the case details and Read More …

CategoriesEbola virusTagsDemocratic Republic of the Congo, Ebola virus disease, Zaire ebolavirus

A second outbreak of an ebolavirus in the DRC

Posted onAugust 2, 2018July 25, 2019

The Ministry of Health (MOH), the Democratic Republic of the Congo (DRC) has confirmed 4 new ebolavirus cases in a new location. Earlier there had been reports of 26 cases Read More …

CategoriesEbola virusTagsBDBV, Bundibugyo ebolavirus, Bundibugyo virus, Democratic Republic of the Congo, ebolavirus, outbreak

Influenza vaccines do have an effect and we need to do more to understand it

Posted onAugust 1, 2018October 15, 20183 Comments

Sometimes it’s hard to convey complex issues in a short-form article written for a general public audience. Other times, stories start off with an overly-simplified title they never recover from. Occasionally they lack any Read More …

CategoriesInfluenzaTagscommunication, effectiveness, influenza, science communication, vaccination

Yes, there were signs that Ebola was in west Africa, perhaps as far back as 1973

Posted onJuly 31, 2018July 31, 2018

If a bat carries the Ebola virus or something related in the forest, people find signs of infection in humans, publish it and read about it, but no-one remembers, does Read More …

CategoriesEbola virusTagsasymptomatic, Ebola virus, forest, mild disease

The hardcore anti-vaxxer and you

Posted onJuly 27, 2018July 27, 20184 Comments

Below is a scenario I recently encountered which was very familiar to me. Boringly so. I’ve tried to put some words around it in case recognising the flow and patterns Read More …

CategoriesVaccines & vaccinationTagsanti-vaccination, fake news, falsehoods, online abuse, social media

Parechovirus on the brain

Posted onJuly 20, 2018August 25, 2018

Two recent papers have added to growing recognition that long-term neurological outcomes can follow severe parechovirus (HPeV) infection of the central nervous system (CNS), in the very young.[1,2] The first Read More …

CategoriesParechovirus

Queensland influenza keeping it cool….

Posted onJuly 20, 2018July 20, 2018

This week’s influenza (flu) data from Queensland’s Department of Health suggest that the virus is toying with Queenslanders – and much of Australia – this season. The total number of Read More …

CategoriesInfluenzaTagsAustralia, Flu, flu season, influenza, Queensland, Queensland Health

Influenza virus haemagglutination: a sticky technique that does a lot of lifting

Posted onJuly 15, 2018July 15, 20186 Comments

Haemagglutination (hemagglutination if you’re from the US) is the sticking (-agglutination) together of red blood cells (RBCs). Haem is the iron-containing, oxygen-transporting portion of haemoglobin, a molecule found in RBCs. This laboratory Read More …

CategoriesInfluenza

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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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