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26 August 2021 – NIWA Science & Technology Fair 2021

This is not happening tomorrow as a live science fair. Like last year it'll be online. More information will be released at some point in the hopefully not too distant future.

26 August 2021 – NZQA exam schedule

NZQA has announced all exams and portfolio due dates will be moved back two weeks, now to be held 22 November to 14 December. More info on NZQA site.

31 July 2021 – the first international vaccination campaign

In 1803 the first international vaccination campaign was launched (literally – they used a ship) by a Spanish physician, Francisco Javier de Balmis, using cowpox to vaccinate against the deadly smallpox virus spreading in Central and South America.

Smallpox was highly contagious and had up to a 52% fatality rate, which is bad enough, but diseases don't just kill. In 18th century Europe, smallpox killed an estimated 400,000 people a year, and caused a third of all cases of blindness. Survivers were left badly scarred.

The vaccination technique discovered a few years earlier by Edward Jenner was effective, but cowpox only lasts in a test tube for 12 days, and there was a big ocean to cross.

To transport the cowpox virus to South America, de Balmis took 22 orphan boys, aged 3 to 10, selected by their carer and nurse Isabel Zendal, who insisted on accompanying them. (She also took her 9 year old son, so maybe only 21 of the boys were orphans.) The children were used as live incubators of the cowpox virus. Every ten days during the voyage, the virus was transferred from the pustules of two infected children to two healthy children, thus maintaining an unbroken strain across the Atlantic Ocean, visiting the Canary Islands, Puerto Rico, and Cuba on the way.

This may seem a somewhat barbaric way to transport a virus, but it was certainly the most practical method at the time. Cowpox was not life threatening, smallpox was.

The boys were left in Mexico, and from that country in 1806 a further 26 boys, aged 4 to 14, were collected for de Balmis' onward trip across the Pacific Ocean to Macau, Canton in China, and the Philippines. Meanwhile, José Salvany, deputy surgeon of the expedition, had gone south to what is now Venezuela, Panama, Colombia, Ecuador, Peru, Chile, and Bolivia. The vaccine was also carried north as far as Texas.

On his return journey to Spain in 1806 de Balmis offered the vaccine to the British in Saint Helena, in the middle of the Anglo-Spanish War (1804-1808).

As this article explains, "By the end of the campaign, about 300,000 people ... had received the vaccine for free." The mission was a success, and an extraordinary achievement.

Smallpox was officially declared to be globally eradicated in 1980. As for vaccines, we have it much easier now. Vaccines can be transported internationally without using orphans, they are safer than they've ever been, and it's easy to get a vaccine. Vaccines work.

By the way, Edward Jenner coined the words "vaccine" and "vaccination" in 1796 from the Latin for "of the cow". Isabel Zendal was recognised by the WHO in 1950 as the first nurse to take part in an international mission.

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