Senegal reopened its land border with Guinea on Monday, pointing to the "significant efforts" of its neighbor in fighting an Ebola outbreak that has claimed thousands of lives.

People and goods can now "move freely by land between the two countries," the interior ministry said in a statement cited by the state-run Senegalese Press Agency.

With virtually no hard proof that medical marijuana benefits sick children, and evidence that it may harm developing brains, the drug should only be used for severely ill kids who have no other treatment option, the nation's most influential pediatricians group says in a new policy.

Some parents insist that medical marijuana has cured their kids' troublesome seizures or led to other improvements, but the American Academy of Pediatrics' new policy says rigorous research is needed to verify those claims.

A British nurse who contracted Ebola while working as a volunteer in Sierra Leone said she was "happy to be alive" as she was discharged from hospital on Saturday having made a full recovery.

Scottish nurse Pauline Cafferkey was diagnosed in Glasgow on December 29 before being transferred to Britain's only isolation ward for Ebola patients at London's Royal Free Hospital.

U.S. government health regulators have approved a second vaccine to prevent a strain of bacteria that can cause deadly cases of meningitis.

The Food and Drug Administration said it cleared Novartis' Bexsero vaccine against a subtype of meningococcal bacteria in people ages 10 to 25. The agency cleared a similar vaccine from Pfizer last October. Prior to that, vaccines available in the U.S. only covered four of the five main subtypes of bacteria that cause meningococcal disease.

A measles outbreak centered around Disneyland in California has spread to six more U.S. states and Mexico, and an international visitor to the theme park likely sparked the health alert, officials said Friday.

Fifty-one confirmed cases of measles have been reported to the Centers for Disease Control and Prevention since late December, the U.S. government agency said in a statement, most in California but others as far afield as Nebraska and Washington states.

The United Nations said on Saturday Liberia was dealing with just five remaining cases of Ebola, in the clearest sign yet that the country is nearing the end of the outbreak.

The worst outbreak of the virus in history has seen the west African nation and its neighbors Guinea and Sierra Leone register almost 9,000 deaths in a year, although experts believe the real toll could be far higher. 

Long-awaited studies of two possible Ebola vaccines are set to begin in West Africa in a couple of weeks, starting in Liberia, U.S. officials said Thursday.

The first study will compare the two experimental vaccines with dummy shots in hopes of proving whether either really protects against the Ebola virus, which has devastated Liberia, Guinea and Sierra Leone over the past year.

Sierra Leone said on Thursday it was ending the "risk allowances" it has been paying to thousands of healthcare workers on the front line of its battle with Ebola.

Steven Gaojia, the co-ordinator of the government's response to the outbreak, told reporters the payments of up to 500,000 leones ($118, 102 euros) a week on top of regular salaries would finish by the end of March.

Lori Simons took the bright orange pill at 3 a.m. Eight hours later, doctors sliced into her brain, looking for signs that the drug was working.

She is taking part in one of the most unusual cancer experiments in the nation. With special permission from the Food and Drug Administration and multiple drug companies, an Arizona hospital is testing medicines very early in development and never tried on brain tumors before.

Seventy people have been infected in a measles outbreak that led California public health officials to urge those who haven't been vaccinated against the disease, including children too young to be immunized, should avoid Disney parks where the spread originated.

New infections linked to the theme parks emerged Wednesday in the outbreak that has spread to five U.S. states and Mexico, though the vast majority — 62 — occurred in California.