CHRONOLOGY: Worst Ebola Outbreak On Record Tests Global Response

Nov 20 (Reuters) - Global health authorities are struggling
to contain the worst Ebola epidemic since the disease was
identified in 1976. (Graphic: here)
    Here is a timeline of the outbreak:    
    March 22: Guinea confirms hemorrhagic fever that killed more
than 50 people is Ebola.
    March 30: Liberia reports two cases; Ebola suspected in
Sierra Leone.
    April 1: Medical charity Medicins Sans Frontieres (MSF)
warns Ebola's spread is "unprecedented." 
    May 26: WHO confirms first Ebola deaths in Sierra Leone.
    June 23: More than 350 deaths make West Africa outbreak 
worst on record; MSF calls for massive resources.
    July 25: Nigeria confirms its first Ebola case.
    July 30: Liberia shuts schools, quarantines worst-affected
communities, using troops for enforcement.
    Aug. 2: U.S. missionary doctor infected with Ebola in
Liberia is flown to Atlanta in United States for treatment.
    Aug. 5: Second U.S. missionary with Ebola is flown from
Liberia to Atlanta.
    Aug. 8: WHO declares epidemic an "international public
health emergency." 
    Aug. 12: Deaths top 1,000; WHO approves use of unproven
drugs or vaccines. 
    Spanish priest with Ebola dies in Madrid hospital.
    Aug. 21: Two U.S. missionary workers released from Atlanta
hospital August 19 and 21 free of virus.
    Aug. 24: Democratic Republic of Congo declares Ebola
outbreak; it is believed separate from West Africa epidemic. 
    Infected British medical worker flown home from Sierra Leone
for treatment.
    Aug. 28: WHO puts deaths above 1,550, warns 20,000 plus
could be infected.
    Aug. 29: Senegal reports first confirmed Ebola case.
    Sept. 3: Epidemic accelerates; deaths top 1,900 with close
to 400 in past week.
    Third U.S. missionary doctor with Ebola flown from Liberia
for treatment in Omaha, Nebraska.
    Sept. 5: WHO says more than 2,100 dead out of about 4,000
thought to have been infected.
    Sept. 8: Britain sending military, humanitarian experts to
Sierra Leone to set up treatment center; United States to send
field hospital to Liberia to care for health workers.
    Fourth Ebola patient will be flown to Atlanta for treatment.
    Sept. 9: WHO says at least 2,296 dead out of 4,293 cases in
five countries.
    Sept. 12: Cuba to send 165 doctors, nurses to Sierra Leone.
    Sept. 13: Liberia appeals to U.S. President Barack Obama for
aid to fight Ebola.
    Sept. 16: United States promises 3,000 military engineers,
medical personnel to West Africa to build clinics, train health
    WHO says 2,461 dead out of 4,985 infected, doubling death
toll in past month.
    Sept. 17: MSF says French nurse volunteer in Liberia has
    Sept. 18: WHO says 2,630 dead out of 5,357 thought infected.
    United Nations mission to combat Ebola will deploy staff in
Liberia, Guinea, Sierra Leone. Security Council wants travel,
border restrictions lifted.
    French President Francois Hollande says military hospital
will be set up in Guinea.
    Sept. 19: Sierra Leone's capital, Freetown, put under
three-day lockdown to try to halt Ebola's spread.
    Sept. 20: Liberian Thomas Eric Duncan flies from Liberia to
Dallas via Brussels and Washington after trying to help woman
with Ebola in his home country.
    Sept. 22: WHO says outbreak largely contained in Senegal and
Nigeria; says Ebola has killed more than 2,811 in West Africa. 
    Sept. 23: U.S. Centers for Disease Control and Prevention
(CDC) estimates between 550,000 and 1.4 million people in West
Africa may have Ebola by January.
    Sept. 25: Duncan goes to Dallas hospital with fever, stomach
pain. He is sent back to apartment where he is staying despite
telling nurse he traveled from West Africa.
    Sept. 26: WHO says 3,091 dead out of 6,574 probable,
suspected and confirmed cases.
    Cuba training 296 more doctors, nurses to treat Ebola in
West Africa, in addition to 165 preparing to go to Sierra Leone.
    Sept. 28: Duncan returns by ambulance to Dallas hospital.
    Sept. 30: CDC confirms Duncan has Ebola; first case
diagnosed in United States.
    Oct. 1: WHO says 3,338 dead out of 7,178 West Africa cases. 
    Cuba sends 165 doctors, nurses to Sierra Leone.
    Oct. 2: Britain pleads for global help to fight Ebola.
    NBC News says American freelance cameraman, Ashoka Mukpo,
has Ebola; will be flown to United States for treatment.
    Oct. 3: WHO: 3,439 dead out of 7,492 suspected, probable and
confirmed cases in West Africa and United States, which has one.
    Ugandan doctor with Ebola arrives in Frankfurt from Sierra
Leone for treatment.
    Oct. 4: Nurse in Liberia who was first French national to
contract Ebola leaves hospital near Paris free of virus.
    Oct. 6: Spanish nurse has Ebola; she treated priest who was
repatriated to Madrid and died.
    Cameraman Mukpo in Omaha; taken to Nebraska Medical Center.
    Oct. 8: Duncan, first person diagnosed with Ebola in United
States, dies in Dallas hospital.    
    United States orders five airports to screen travelers from
West Africa for fever.
    Oct. 9: WHO revises deaths to 3,865 out of 8,033 cases, says
no evidence Ebola is being brought under control in West Africa.
    Britain to screen travelers entering country through
London's main airports and Eurostar rail link with Europe.
    Some lawmakers want United States to ban travelers from West
African countries hit hardest by Ebola.
    Oct. 10: WHO: 4,033 dead out of 8,399 cases in seven
countries. Most fatalities in Liberia, Sierra Leone and Guinea.
    Oct. 11: New York's John F. Kennedy International Airport
begins screening travelers from three West African countries for
Ebola symptoms.
    Oct. 12: Dallas nurse Nina Pham has Ebola; first person to
contract it in United States. Infected while caring for Duncan.
    Oct. 14: At London's Heathrow airport, Britain begins
screening travelers from West Africa.
    Sudanese U.N. medical official who contracted Ebola in
Liberia dies in German hospital.
    Oct. 15: Second Texas nurse who treated Duncan has Ebola.
Amber Vinson will be treated at Atlanta's Emory University
Hospital. She took flight from Cleveland to Dallas/Fort Worth
International Airport while running slight fever. 
    WHO says 4,493 dead out of 8,997 cases, epidemic spreading
in West Africa.
    Oct. 16: U.S. congressional subcommittee questions health
officials about American response to Ebola. National Institutes
of Health says nurse Pham will be moved to NIH isolation unit in
Bethesda, Maryland, from Dallas.    
    Oct. 17: WHO says 4,546 dead out of 9,191 cases. Senegal
declared free of Ebola. Obama appoints Ebola response
    Oct. 19: Nigeria declared free of Ebola. Spanish nurse
appears to be cured.
    Oct. 20: In Texas, 43 people taken off Ebola watch lists.   
 United States issues stricter guidelines for those treating
Ebola victims.
    Oct. 21: Medicins Sans Frontieres will start trials of
experimental Ebola drugs at its West Africa treatment centers in
    Cuba sends 53 doctors, nurses to Liberia, 38 to Guinea to
treat Ebola patients; second group from that country.
    As of Oct. 22, travelers to United States from Liberia,
Sierra Leone and Guinea must fly into one of five airports for
enhanced screening.
    Oct. 22: United States will monitor for 21 days anyone
entering from three countries at center of epidemic.
    NBC cameraman Mukpo leaves Nebraska hospital free of Ebola.
    Oct. 23: New York City doctor Craig Spencer, who treated
patients in Guinea, tests positive for Ebola.
    Mali becomes sixth West African country hit by Ebola.
    Oct. 24: Dallas nurse Pham leaves hospital free of Ebola.
    New York and New Jersey order quarantine of medical workers
returning from Ebola-hit West African countries. Nurse Kaci
Hickox tests negative and is quarantined, under protest, for two
days in New Jersey. She goes to Maine, where she is ordered
isolated in her home. She challenges that order.
    Oct. 25: WHO says 4,922 dead out of 10,141 cases.
    Illinois orders quarantine of all high-risk travelers
returning from Ebola-hit West African countries.
    Oct. 26: Florida will monitor for 21 days people returning
from Ebola-hit countries, quarantine "high-risk" individuals.
    Oct. 27: U.S. Army isolating personnel returning from Ebola
missions in West Africa.
    Australia becomes first developed country to shut its
borders to areas hardest hit by Ebola; bans visas for citizens
of Sierra Leone, Liberia and Guinea.
    Oct. 28: Dallas nurse Vinson leaves Emory University
Hospital free of Ebola.
    Oct. 29: Quarantine-like monitoring expanded to all U.S.
military personnel returning from West Africa Ebola missions.
    California enacts 21-day quarantine of travelers who had
contact with Ebola patients.
    Oct. 31: Canada stops issuing visas to people from Sierra
Leone, Liberia and Guinea.
    Nov. 3: Mali thought to be Ebola-free; officials search for
39 people who traveled on buses with child who died from virus. 
    In Maine, nurse Hickox will not be quarantined.
    Nov. 5: WHO revises deaths downward for second week running
to 4,818 out of 13,042 cases as of Nov. 2. Says weekly cases
rising in Sierra Leone, slowing in Liberia, Guinea is stable. 
    Obama to ask Congress for $6.2 billion in new fiscal year to
fight Ebola, sources say.
    China plans to send 1,000 medical workers, experts to West
Africa, Xinhua news agency reports. 
    Australian Prime Minister Tony Abbott says his country will
fund treatment clinic in Sierra Leone.
    Nov. 7: 4,950 dead out of 13,241 cases in worst-hit West
Africa countries.
    Dallas declared Ebola-free.
    Nov. 11: Mali confirms second Ebola case; locks down clinic.
    New York doctor Spencer leaves hospital free of virus.
    Nov. 12: 5,147 dead out of 14,068 cases in Guinea, Liberia
and Sierra Leone; 13 deaths, 30 cases in five other countries.
    Mali's Ebola deaths rise to four; more than 90 quarantined.
    U.S. nurses protest over Ebola protection; Sierra Leone
health workers strike over pay.
    Nov. 13: Mali imposes tougher health checks at border
crossings after its second outbreak.
    Eighty U.S. troops return to United States from Liberia and
begin 21 days monitored isolation.
    Nov. 14: 5,177 dead, mostly in Liberia, Sierra Leone and
Guinea, out of at least 14,133 cases in those and five other
    Nov. 15: About 160 Chinese health workers arrive in Liberia
to staff new Ebola clinic built and run by Chinese personnel.
    Martin Salia, a Sierra Leonean surgeon who is a U.S.
resident and critically ill with Ebola, is flown from his home
country to Nebraska Medical Center.
    Nov. 16: Liberia sets national target of no new Ebola cases
by Dec. 25.
    United States adds Mali to countries whose travelers get
Ebola screening.
    Nov. 17: Dr. Salia, 44, dies at Nebraska Medical Center, the
second person to succumb to Ebola in the United States.
    Nov. 18: Cuban doctor Felix Baez treating Ebola patients in
Sierra Leone tests positive for the virus.
    Nov. 19: 5,420 deaths out of 15,145 cases. WHO says Ebola
transmission is "intense and widespread" in Sierra Leone.
    Nov. 20: Dr. Baez is flown out of Sierra Leone for treatment
in Geneva.

 (Writing by Jonathan Oatis; Editing by Toni Reinhold)