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markgpritchard.bsky.social
Mark Pritchard
@markgpritchard.bsky.social
570 followers 1K following 70 posts
Curious about the world, and more specifically about communicable disease dynamics.
https://orcid.org/0000-0003-1726-8989
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markgpritchard.bsky.social
Bar chart of temperature change in Birmingham
June 21, 2025 at 9:44 PM
markgpritchard.bsky.social
These stripes show a clear trend. This is 174 years’ of climate in Birmingham. (The website also has versions as bar charts that allow finer comparison between years.) #ShowYourStripes @uniofreading.bsky.social

showyourstripes.info/s
Graphical representation of temperature change in Birmingham since 1850. There is a vertical line for each year. There is a mix of colours, many pale and blue for years before the 1980s. The most recent years are vivid reds
June 21, 2025 at 9:41 PM
markgpritchard.bsky.social
Goose
Photograph of a Canada goose on a wooden deck
April 23, 2025 at 5:24 AM
markgpritchard.bsky.social
When I said I would paint the house…
Acrylic on paper. Day 17 #ArtAdventCalendar (It isn’t actually my house)
Acrylic painting of a house
December 17, 2024 at 11:57 PM
markgpritchard.bsky.social
Self-portrait for day 16 of #ArtAdventCalendar
Pencil drawing of my face, looking directly at the viewer
December 16, 2024 at 8:49 PM
markgpritchard.bsky.social
A painting of Gylen Castle on the island of Kerrera for #ArtAdventCalendar day 15.
Acrylic on canvas
Acrylic painting. A castle on a hill with a beach in the foreground
December 15, 2024 at 4:00 PM
markgpritchard.bsky.social
For day 14 of #ArtAdventCalendar I am sharing a watercolour study of flowers
Watercolour painting of flowers. There are red and orange poppies and a purple spiky flower
December 14, 2024 at 9:42 PM
markgpritchard.bsky.social
Coloured pencil drawing of a redwing. #ArtAdventCalendar day 13
Coloured pencil drawing of a redwing, a brown thrush with a red patch under its wing
December 13, 2024 at 8:43 PM
markgpritchard.bsky.social
Day 12: halfway through #ArtAdventCalendar. I have really enjoyed this so far. I don't know if I have another dozen pictures but I'll continue as far as I can. Today I am sharing this photograph of a polar bear being chased away from her meal by a big male under the midnight sun, north of Svalbard
Photograph of two polar bears. The one in the foreground is jumping from one piece of ice to another but is about to land in the water. Behind her, a second polar bear stands next to the carcass of a seal
December 12, 2024 at 9:01 AM
markgpritchard.bsky.social
A photograph of Bryce Canyon at sunrise. #ArtAdventCalendar day 11
Photograph of Bryce Canyon at sunrise. The light is making the orange rock look even more orange. In the foreground, hoodoos (stone columns) make patterns of light and shadow. Behind them is a cliff of striped rock with trees at the top. The sky is blue with the moon visible just above the trees.
December 11, 2024 at 7:56 AM
markgpritchard.bsky.social
Bergen port at night. #ArtAdventCalendar day 10
Pastel on sugar paper. I feel I still have a lot to learn about using pastels, and there is a lot that could be improved in this image, but I was pleased with some of the effects
Pastel drawing of Bergen port at night. On the far side of the port are a ship and some buildings, with lights that are reflected in the harbour water. The remains of a sunset are visible just above the horizon
December 10, 2024 at 8:26 AM
markgpritchard.bsky.social
Photo portrait of a gentoo penguin for day 9 #ArtAdventCalendar
Photograph of a gentoo penguin. The background is white, providing a strong contrast with the black plumage of the penguin's head, and almost merging with the white on its chest
December 9, 2024 at 8:06 AM
markgpritchard.bsky.social
For day 8 of #ArtAdventCalendar a pair of ring-trailed lemurs
Photograph of ring-tailed lemurs. A mother with an infant on her back, both looking at the camera
December 8, 2024 at 9:31 AM
markgpritchard.bsky.social
A painting of Broken Arch, Arches National Park, for day 7 of #ArtAdventCalendar
Acrylic on canvas
Acrylic painting of Broken Arch. a sandstone arch in Arches National Park. It's a sunny day with a blue sky, the arch is a sandy brown colour, and there are green trees in the background
December 7, 2024 at 9:11 AM
markgpritchard.bsky.social
For day 6 of #ArtAdventCalendar, a reflective avocet at Parc Ornithologique du Pont de Gau
A photograph of an avocet in water with a very clear reflection. The image is inverted so the reflection appears the right-way-up, and the bird appears upside-down
December 6, 2024 at 6:24 PM
markgpritchard.bsky.social
Staying with photographs from Madagascar for day 5 of #ArtAdventCalendar, I am sharing this picture of a Malagasy paradise flycatcher
Photograph of a Malagasy paradise flycatcher. It sits on a horizontal stick in dense woodland. Two long white feathers hang down from its tail
December 5, 2024 at 7:46 AM
markgpritchard.bsky.social
A photograph for day 4 of #ArtAdventCalendar: This mouse lemur lives under the roof of a building at the botanical gardens just outside Toliara, Madagascar.
Photograph of a mouse lemur at nighttime. The lemur is on a wooden beam, looking out from under a green-coloured corrugated roof
December 4, 2024 at 1:06 PM
markgpritchard.bsky.social
This was intended as an exercise but I was pleased with the result, so for day 3 of #ArtAdventCalendar I am sharing a drawing of Tower Bridge. Pencil and pen on paper
Pen drawing a of a Tower Bridge. Two towers with arches at the bottom with a road running through, and two high-level walkways connecting the towers
December 3, 2024 at 8:57 AM
markgpritchard.bsky.social
For day 2 of #ArtAdventCalendar I am sharing this painting of a skein of greylag geese flying over Coral Beach on the Isle of Skye. The beach isn't actually made of coral but that doesn't make it any less beautiful.
Acrylic on canvas
Acrylic painting. A beach curves around a bay on the left. In the foreground the beach is mostly black, becoming mostly white further away. Overhead, 16 greylag geese fly from right to left
December 2, 2024 at 8:02 AM
markgpritchard.bsky.social
I cannot profess to be an artist, but the amazing
#ArtAdventCalendar images have inspired me to try sharing a few. I'll start simple for day 1 with the picture I already have as a banner on here:
Photograph of a greater flamingo at Parc Ornithologique du Pont de Gau, France
Photograph of a flying greater flamingo, taken with a slow exposure so its wings and the background are a blur of movement
December 1, 2024 at 9:09 AM
markgpritchard.bsky.social
It’s a beautiful day. Time to vote!

Polling stations are open until 10 p.m. Make sure you remember to take identification
Polling station
July 4, 2024 at 6:18 AM
markgpritchard.bsky.social
Too cloudy for fancy photography but amazing to see. Totality in Austin
The sun’s corona, looking small in a cloudy sky
April 8, 2024 at 7:38 PM
markgpritchard.bsky.social
These are really fun. Here’s mine
Cloud of words in various colors and sizes based on the Google Scholar profile for Mark Pritchard. Some of the largest words include clinical COVID-19 isaric patient enhanced hospital recovery study data cohort hip knee observational outcomes replacement report review systematic 2020 breast children hospitalised prospective protocol admitted characteristics cost-effectiveness costs effectiveness factors
February 4, 2024 at 8:23 PM
markgpritchard.bsky.social
This winter wonderland might make me reconsider whether winter really does start on December 1. Keep safe everyone
Snowy scene at night
December 1, 2023 at 8:39 PM
markgpritchard.bsky.social
So many great presentations at #EPIDEMICS9. Particularly enjoyed talking to people about my work on immunity and immune boosting. I’m going home with a long list of preprints to read, and would love it when f you would like to read mine: doi.org/10.1101/2023...
Conference poster. Title: Natural immune boosting leads to synchrony in immunity and cyclic outbreaks of disease for pathogens with rapidly waning immunity
December 1, 2023 at 1:51 PM