Spain says it has overcome the 'toughest phase' of coronavirus as the country reports its lowest number of deaths in one day for more than a month.

The 367 registered deaths in the previous 24 hours represented just a 1.7% increase overall, down from 440 the previous day, and the lowest since March 21.

However, with 22,524 deaths in total, Spain still has the world's third-highest tally after the United States and Italy.

Cases rose over 6,700 to 219,764 from the day before, but the rise in new infections based on more specific testing was much lower, at 2,796, meaning those cured, at 3,105, surpassed new infections for the first time.

'We have indeed overcome the toughest phase, the most critical phase of the disease, thanks mainly to the effort of the whole Spanish society,' government spokeswoman Maria Jesus Montero told a news briefing.

However, deaths fell to 367 in their smallest jump since March 21, as seen on this graph

Although calling for prudence due to many yet unknown aspects of the virus, Health Minister Salvador Illa said the epidemic's curve had reversed, allowing the government to plan a gradual exit from a national shutdown since mid-March.

'The direction of the transition will be overseen by the government based on criteria that we will start discussing with the regions this afternoon,' he said, without elaborating.

According to Cadena SER radio, the government started to outline thresholds for further easing next month of the economically-crippling lockdown for regions with the lowest contagion rates and least burdened intensive care units.

For restrictions to be lifted, there must be no more than two daily cases per 100,000 people in an area, or COVID-19 patients must occupy no more than half of ICU beds.

This graph shows the daily number of new coronavirus cases in Spain, which leaped to 6,740 today - the highest figure since April 4

However Spain recorded its biggest daily leap in coronavirus cases for nearly three weeks as another 6,740 people were added to the tally today.

The thousands of positive tests bring the Spanish total from 213,024 to 219,764 in the biggest increase since 7,026 were recorded on April 4.

The jump is partly explained by the growing use of antibody tests, which have added nearly 17,000 people to the total since they were introduced.

Spain said today that 16,774 people had tested positive via the antibody test method, an increase of 3,944 from yesterday's total of 12,830.

Only 2,976 of the 6,740 new cases were confirmed using a traditional PCR test, official figures showed.

The Madrid region accounted for 1,097 of those while the second worst-hit region of Catalonia was responsible for another 652.

Antibody tests show whether a patient's immune system has developed defences against coronavirus, meaning they have been infected in the past.

However, governments in several countries have warned that antibody tests are not yet reliable enough to roll out on a large scale.

Spanish health officials believe the epidemic peaked on April 2 when 950 people died over 24 hours, nearly three weeks after the government imposed a lockdown.

'We have achieved the goal of a deceleration and slowdown for this week but we remain in a hard phase of the epidemic,' health minister Salvador said yesterday.

The March 14 lockdown has been twice extended and parliament late on Wednesday approved a fresh extension until May 9,

However, conditions will be slightly eased from Sunday to allow children to spend some time outside.

Healthcare workers attend to a coronavirus patient at the intensive care unit of the La Paz University Hospital in Madrid yesterday

Medical workers wearing protective suits perform a tracheotomy on a coronavirus patient at a hospital in Madrid yesterday, in the worst-affected region of Spain

Prime Minister Pedro Sanchez hopes to ease some restrictions in the second half of May but warns that 'de-escalation will be slow'.

In Madrid, authorities began shutting down hotels that had been hastily converted into medical centres after the outbreak left city hospitals unable to cope.

Spain started easing restrictions for some businesses last week, but restaurants, hotels and public spaces remain shut.

Hotels saw a 66 per cent plunge in foreign visitors in March, even though a shutdown only came late in the month.

Tourism usually accounts for 12 per cent of gross domestic product in the world's second-most visited nation.

In further evidence of a downturn, automotive industry association Anfac said March car production fell 45 per cent year-on-year as factories stood empty.

Meanwhile, a new study suggests that the virus may have been circulating among the population as early as mid-February, when the government only acknowledged 'community transmission' in early March.

The scientists at Madrid's Instituto de Salud Carlos III also found that the virus entered Spain via at least 15 different points.

Anticipating more people outside, the government has started capping prices of protective surgical masks at 0.96 euros ($1.04) a piece, and of disinfecting gels and solutions at 0.015-0.021 euros per millilitre depending on packaging volume.

Though fewer, the daily deaths and infections still strain services such as hospitals and funeral parlours.

In Catalonia, Spain's second hardest-hit region, the regional administration's separatist leader Quim Torra criticised the central government's handling of the epidemic, saying it would have worked out better 'without impositions'.

He also called for more financial aid.

Torra urged all Catalan political forces to meet and unite policy over the epidemic, accepting a proposal from the opposition Socialists and centre-right Ciudadanos.

He was speaking to just a handful of lawmakers physically present in the Catalan parliament, which was set to approve later on Friday a regional budget for the first time in three years.