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retep_yelir @retepyelir.bsky.social · Nov 26

In case you are wondering, I've transferred all of my previous messages from Twitter to Bsky so the dates of my posts on Bsky don't match the original dates of their publication on Twitter. I'm planning to start posting new material soon.

retep_yelir @retepyelir.bsky.social · Nov 24

Tidying up my office and came across this - circa 1988. This is how we regularly identified anaerobes back then. The second image is the gas liquid chromatograph showing a butyric acid peak - a characteristic of fusobacterium. You could even do GLC directly on pus specimens.

retep_yelir @retepyelir.bsky.social · Nov 24

Just found this brilliant BBC series from 1974 -Microbes and Men (6 episodes). The first episode is about Ignaz Semmelweis. If you don't have time to watch it all, skip to 29 minutes and see what happens to the medical student who didn't wash his hands.

youtube.com/watch?v=0F3f0F…

retep_yelir @retepyelir.bsky.social · Nov 24

This turned out better than I anticipated. Staph aureus, Serratia and Klebsiella on chromogenic agar combining to wish you all a Merry Christmas.

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retep_yelir @retepyelir.bsky.social · Nov 24

ES Anderson was born on 28th September 1916. He was instrumental in helping solve the cause of the 1964 Aberdeen typhoid outbreak, but is best remembered for his work on transmissible antibiotic resistance, being one of the first to warn on the dangers it posed to human health.

retep_yelir @retepyelir.bsky.social · Nov 24

Yesterday was the centenary of the birth of the bacteriologist Naomi Datta. In 1962 she observed transmissible antibiotic resistance during an outbreak of Salmonella typhimurium at the Hammersmith Hospital. She later became a leading expert on the "R factors" that cause this.

retep_yelir @retepyelir.bsky.social · Nov 24

Rudolf Weigl, born 2nd September 1883, known for the development of a vaccine against typhus. During WW2 in occupied Poland, he protected hundred of people from the Nazis by employing them as "lice feeders" in his lab while conducting further research.

sprawiedliwi.org.pl/en/stories-of-…

retep_yelir @retepyelir.bsky.social · Nov 24

Driving through Tulare county. George McCoy isolated a bacterium from ground squirrels here in 1911, naming it Bacillus tularensis. In 1922 Edward Francis showed that it could infect humans. The disease is now known as tularemia and the bacterium as Francisella tularensis.

retep_yelir @retepyelir.bsky.social · Nov 24

Type 7 on the Bristol stool chart, I think. From a bear! On the Valley Loop Trail in Yosemite Valley.

retep_yelir @retepyelir.bsky.social · Nov 24

Even though I'm on holiday there is no escaping the day job. A poster on display in Yosemite.

retep_yelir @retepyelir.bsky.social · Nov 24

Baruch Blumberg, born 28th July 1925. While investigating protein polymorphisms he and his co-workers identified a hitherto undescribed protein, now know as hepatitis B surface antigen. Further work led to the development of a highly effective vaccine.

nobelprize.org/prizes/medicin…

retep_yelir @retepyelir.bsky.social · Nov 24

Wilhelm Burgdorfer, Swiss-American bacteriologist/entomologist born 27th June 1925, known for his work on infections transmitted by ticks. The distribution of arthropod-borne infections is changing and this publication desribes potential threats to the UK.

ncbi.nlm.nih.gov/pmc/articles/P…

retep_yelir @retepyelir.bsky.social · Nov 24

Came across this on today's bench round in the lab. Colombia blood agar, 18 hour incubation at 37 C with 5% carbon dioxide. Small Gram-negative bacilli, catalase and oxidase positive with a very strong fruity smell, reminiscent of a very ripe pineapple. Identity of the bacteria?

retep_yelir @retepyelir.bsky.social · Nov 24

Adolf Weil was born 7th February 1848. Known for Weil's disease, he described the clinical condition in 1886. Much later this was shown to be caused by a spirochaete. See this really good review with historical details and up to date microbiology.

journals.asm.org/doi/10.1128/CM…

retep_yelir @retepyelir.bsky.social · Nov 24

Walter Burkholder, American plant pathologist, born 1st February 1891. The genus 𝘉𝘶𝘳𝘬𝘩𝘰𝘭𝘥𝘦𝘳𝘪𝘢, named in his honour, includes bacteria that cause diseases in plants, but also some important animal and human pathogens such as the causes of glanders and melioidosis.

retep_yelir @retepyelir.bsky.social · Nov 24

Max Theiler, born 30th Jan 1899. One of my former trainers said he once met an elderly Max Theiler at a formal dinner. Not knowing who he was, he asked him what he did in the past. "Oh, I dabbled a bit in virology" he replied. I think he more than dabbled.

nobelprize.org/prizes/medicin…

retep_yelir @retepyelir.bsky.social · Nov 24

I forgot to post this yesterday. Perhaps an example of male bias. Alice Evans, born on 29th Jan 1881 showed that unpasteurised cow milk could transmit brucellosis. It wasn't believed. Surely if it were true someone else (a man?) would have discovered that?

ncbi.nlm.nih.gov/pmc/articles/P…

retep_yelir @retepyelir.bsky.social · Nov 24

Edmond Nocard, French veterinarian, born 29th January 1850. He highligted the public health importance of bovine tuberculosis but is best remembered for describing the genus of bacteria that bare his name. Nocardia is a rare but important human pathogen.

sciencedirect.com/science/articl…

retep_yelir @retepyelir.bsky.social · Nov 24

Ferdinand Cohn born 24thJanuary 1828. Trained as a botanist, he worked on algae before switching to bacteriology. He was the first to describe endospores and his taxonomy of bacteria based on morphology is still in use. He was also instrumental in promoting Koch's early work.

retep_yelir @retepyelir.bsky.social · Nov 24

Fritz Kaufmann born 15th January 1899, the other half of the Kauffmann-White scheme for classification of salmonella, that I wrote about last month. He worked at the Robert Koch Institut in Berlin. Forced to leave in 1933, he moved to the Statens Serum Institut in Copenhagen.1/2

retep_yelir @retepyelir.bsky.social · Nov 24

Norman Heatley born 10th Jan 1911. Once the "forgotten man" in the history of penicillin discovery, he is now rightly recognised. His ingeniously designed culture vessel, a modified bedpan, yielded enough penicillin to allow treatment trials in humans.

nms.ac.uk/explore-our-co…

retep_yelir @retepyelir.bsky.social · Nov 24

Rebecca Lancefield, born 5thJanuary 1895. For a long time all haemolytic streptococci were thought to be a single species. In her classic paper from 1933, Lancefield showed how different species could be identified by their different carbohydrate antigens.

ncbi.nlm.nih.gov/pmc/articles/P…

retep_yelir @retepyelir.bsky.social · Nov 24

Philip Bruce White was born on 29th December 1891. He researched the antigenic structure of salmonella and purposes a method of classification in his 1926 publication. Fritz Kaufmann expanded this in the 1930s leading to the widely used Kaufmann-White scheme. 1/2.

retep_yelir @retepyelir.bsky.social · Nov 24

Merry Christmas to everyone. Here is some agar art from our microbiology/infectious diseases trainees at St George's. Alexander Fleming is believed to have been the first germ artist and some of his "paintings" can be seen at the Alexander Fleming Laboratory Museum at St Mary's.

retep_yelir @retepyelir.bsky.social · Nov 24

Gladys Dick, American bacteriologist, born on 18th December 1881. With her husband George, she investigated the pathogenesis of scarlet fever, demonstrating the role of haemolytic streptococci. They devoloped antitoxin treatment which was widely used in the pre-antibiotic era.