Class of 2020A

All four suspected Ebola cases admitted to hospitals in Spain on Thursday have tested negative for the virus in the initial rounds of tests, authorities said on Friday.

After an incubation period of 5-10 days, the onset of the disease is sudden and is marked by fever, chills, headache, and myalgia. Around the fifth day after the onset of symptoms, a maculopapular rash, most prominent on the trunk (chest, back, stomach), may occur. Nausea, vomiting, chest pain, a sore throat, abdominal pain, and diarrhea then may appear. Symptoms become increasingly severe and may include jaundice, inflammation of the pancreas, severe weight loss, delirium, shock, liver failure, massive hemorrhaging, and multi-organ dysfunction.

The two nuns arrived Monday at 17.45 local time (23.45 GMT) at the Monsignor Oscar Arnulfo Romero International Airport, located about 44 miles south of San Salvador, said Health Minister, Violeta Menjivar, in a meeting with the press international, but she did not specify the nationality of the missionaries. “Currently there are quarantined in a place to be determined by the Catholic church, and that they are being attended to daily. They are healthy, but they are being quarantined as a preventative measure against Ebola,” she added.

West Africa is struggling with the worst Ebola outbreak on record, and two U.S. nurses have contracted the disease treating a Liberian man who died in Texas. A nurse in Spain was infected while caring for two priests, who both died of Ebola.

Ebola has killed 4,493 people, or about 50 percent of the known 8,997 cases,

Focusing on the cases of two dogs can seem trivial compared to the 4,000 people in West Africa who have died from Ebola this year.

Some studies have shown that dogs may experience asymptomatic Ebola infections, the CDC says -- meaning they may have the virus but don't get sick. Also, the agency says, human infections haven't been linked to dogs.

On 5 October 2014, the Ministry of Health (MoH) of Uganda notified WHO of a confirmed case of Marburg virus disease (MVD) in Kampala, Uganda.

Marburg and virulent Ebola viruses are maintained in hosts that are rare and have little contact with humans or do not readily transmit virus. Bats (particularly solitary microchiropteran species) are leading contenders as reservoir hosts. Virus transfer to humans occurs by contact with the primary reservoir or via an intermediate animal that acquired infection from the reservoir and is, in turn, hunted by humans. An interesting possibility is that filoviruses may be arthropod or plant viruses, with non—blood-feeding arthropods transmitting the virus to intermediate hosts or humans during oral ingestion or envenomation. Paradoxically, in Africa, Ebola virus disease has high lethality and high seroprevalence as determined by the IFA test. If the seroreactivity is confirmed by more specific tests, then the Ebola virus serogroup in Africa probably contains an antigenically cross-reactive, enzootic, nonpathogenic agent(s). Such viruses may have separate life cycles or may give rise to virulent strains by mutation.