David Cameron is urging other European countries to introduce Ebola screening regimes at airports, warning they must do more to halt the spread of the killer disease.

The Prime Minister is to use a summit in Brussels next week to push for more funding and assistance for West African states struggling to contain the disease.

But he has also voiced doubts about the quality of protection in Europe, saying other governments should emulate the checks brought in by the UK.

The concerns came amid criticism of the US response. A nurse with Ebola was allowed aboard a flight from Ohio to Texas despite telling officials she had a fever.

US authorities are trying to track down 132 people who flew with Amber Joy Vinson, infected along with a colleague after caring for an Ebola patient. President Obama has cancelled political campaigning to focus on Ebola, pledging a "much more aggressive" approach to the disease.

Meanwhile, three people are being tested in Spain, including one who arrived on an Air France jet that was isolated at Madrid airport as a precaution.

The man - who had travelled from Lagos, Nigeria - was taken by ambulance to hospital. The driver wore full protective gear.

Another person who came into contact with infected Spanish nursing assistant Teresa Romero has a high temperature and is being monitored, and a missionary just back from Ebola-hit Liberia has a fever and is being tested.

British army medics have begun arriving in Sierra Leone to help fight the disease.

A team of 91 including nurses, and doctors will join 40 soldiers already in the west African country at a UK-backed treatment centre, which has 12 of its 92 beds set aside for health-care workers who risk infection treating others.

The deployment comes ahead of the departure tomorrow of Royal Navy ship RFA Argus, which should reach the area by the end of the month with 225 more military personnel from a total planned deployment of 750.

A Downing Street spokesman said a Cobra emergency committee meeting chaired by Mr Cameron was told the Chief Medical Officer still regarded the risk to the UK as low.

"There was a discussion over the need for the international community to do much more to support the fight against the disease in the region," the spokesman said.

"This included greater co-ordination of the international effort, an increase in the amount of spending and more support for international workers who were, or who were considering, working in the region.

"The Prime Minister set out that he wanted to make progress on these issues at the European Council next week." The spokesman added: "There was a detailed update about plans for protecting the UK against Ebola."

Meanwhile former UN secretary general Kofi Annan told the BBC's Newsnight that developed countries had failed to respond to the crisis until it reached their shores.

"I am bitterly disappointed by the response," he said. "I am disappointed in the international community for not moving faster. In this world we are in it together.

"If the crisis had hit some other region it probably would have been handled very differently. When you look at the evolution of the crisis, the international community really woke up when the disease got to America and Europe."

First Minister Alex Salmond has said Scotland is well prepared to deal with any cases of Ebola, despite the low risk here.

There have been 8,997 cases of Ebola, including 4,493 deaths, mostly in Sierra Leone, Liberia and Guinea, in the current outbreak.