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It is dangerous to draw too many parallels between coronavirus and the 1918 Spanish flu pandemic, that killed at least 50 million people around the world.

Covid-19 is an entirely new disease, which disproportionately affects older people. The deadly strain of influenza that swept the globe in 1918 tended to strike those aged between 20 and 30, with strong immune systems.

But the actions taken by governments and individuals to prevent the spread of infection have a familiar ring to them.

Public Health England studied the Spanish flu outbreak to draw up its initial contingency plan for coronavirus, the key lesson being that the second wave of the disease, in the autumn of 1918, proved to be far more deadly than the first.

Britain was still at war when the virus claimed its first recorded victim, in May 1918. The government, like many others, was caught on the hop. It appears to have decided that the war effort took precedence over preventing flu deaths.

The disease spread like wildfire in crowded troop transports and munitions factories, and on buses and trains, by Sir Arthur Newsholme for the Royal Society of Medicine.

But a "memorandum for public use" he had written in July 1918, that advised people to stay at home if they were sick and to avoid large gatherings, was buried by the government.

Sir Arthur argued that many lives could have been saved if these rules had been followed, but he added: "There are national circumstances in which the major duty is to 'carry on', even when risk to health and life is involved."

The flu did not originate in Spain, but Spain was the first country to report deaths from it, leading to the assumption that it must have started there. Spain's newspapers were not subject to wartime censorship, because it was a neutral country. News of the epidemic was initially suppressed in other countries to avoid damaging morale.

In 1918, there were no treatments for influenza and no antibiotics to treat complications such as pneumonia. Hospitals were quickly overwhelmed.

There was no centrally imposed lockdown to curb the spread of infection, although many theatres, dance halls, cinemas and churches were closed, in some cases for months.

Pubs, which were already subject to wartime restrictions on opening hours, mostly stayed open. The Football League and the FA Cup had been cancelled for the war, but there was no effort to cancel other matches or limit crowds, with men's teams playing in regional competitions, and women's football, which attracted large crowds, continuing throughout the pandemic.

Streets in some towns and cities were sprayed with disinfectant and some people wore anti-germ masks, as they went about their daily lives.

Public health messages were confused - and, just like today, fake news and conspiracy theories abounded, although the general level of ignorance about healthy lifestyles did not help.

In some factories, no-smoking rules were relaxed, in the belief that cigarettes would help prevent infection.

During a Commons debate on the pandemic, Conservative MP Claude Lowther asked: "Is it a fact that a sure preventative against influenza is cocoa taken three times a day?"

Publicity campaigns and leaflets warned against spreading disease through coughs and sneezes.

In November 1918, the News of the World advised its readers to: "wash inside nose with soap and water each night and morning; force yourself to sneeze night and morning, then breathe deeply. Do not wear a muffler; take sharp walks regularly and walk home from work; eat plenty of porridge."

No country was untouched by the 1918 pandemic, although the scale of its impact, and of government efforts to protect their populations, varied widely.

In the United States, some states imposed quarantines on their citizens, with mixed results, while others tried to make the wearing of face masks compulsory. Cinemas, theatres and other places of entertainment were closed across the country.

New York was better prepared than most US cities, having already been through a 20-year campaign against tuberculosis, and as a result suffered a lower death rate.

Nevertheless, the city's health commissioner came under pressure from businesses to keep premises open, particularly movie theatres and other places of entertainment.

Then, as now, fresh air was seen as a potential bulwark against the spread of infection, leading to some ingenious solutions to keep society going.

But it proved impossible to prevent mass gatherings in many US cities, particularly at places of worship.

By the end of the pandemic, the death toll in Britain was 228,000, and a quarter of the population are thought to have been infected.

Efforts to kill the virus continued for some time, and the population were more aware than ever of the potentially deadly nature of seasonal influenza.

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