West African Ebola virus epidemic timeline of reported cases and deaths
Timeline, tables and graphs WHO flag
Notation Timeline, tables and graphs at the apex of the West African Ebola virus epidemic Table of graphs and parameters
In March 2014, the World Health Organization (WHO) reported a major Ebola outbreak in Guinea , a western African nation,[ 1] the disease then rapidly spread to the neighboring countries of Liberia and Sierra Leone with smaller outbreaks occurring in Senegal , Nigeria , and Mali ; the resulting West African Ebola virus epidemic is the largest Ebola outbreak (cases and deaths ) ever documented.[ 1]
Background
Researchers believe that a 2-year-old boy who lived in the village of Meliandou , Guéckédou Prefecture , Guinea was the index case of the current Ebola virus disease epidemic. The boy died in December 2013. His mother, sister, and grandmother then became ill with similar symptoms and also died. Although Ebola represents a significant public health problem in sub-Saharan Africa and was documented[ 2] in Tai Forest chimpanzees , only one case had been reported in humans in West Africa .[ 3] With this background and in the context of poor public health systems,[ 4] the early cases were mis-diagnosed as diseases more common to the area. Thus Ebola virus disease spread for several months before it was recognized as such.[ 5] [ 6] In late October 2014, the boy was later identified as Emile Ouamouno.[ 7] [ 8] In a Tuesday, December 30, 2014 online world news story article by Richard Ingham from the Agence France-Presse (AFP) that was featured on the MSN homepage, it was revealed that a tree in the area where children had played at, playing with insect-eating free-tailed bats and hunting and grilling them to eat (they are a cousin of another well-known Ebola reservoir, the fruit bat , whose role in this outbreak is not as clear), is believed to be the point where human infection – likely by the bats – with Ebola in this current outbreak occurred, the 'ground zero' of the epidemic. This is not yet known decisively, but scientists have enough knowledge to go public with the story.[ 9]
Timeline of reported cases and deaths
Data sources
Data comes from reports by the World Health Organization Global Alert and Response Unit[ Resource 1] and the WHO's Regional Office for Africa.[ Resource 2] All numbers are correlated with United Nations Office for the Coordination of Humanitarian Affairs (OCHA), if available.[ Resource 3] The reports are sourced from official information from the affected countries' health ministries. The WHO has stated the reported numbers "vastly underestimate the magnitude of the outbreak", estimating there may be 3 times as many cases as officially reported.[ 10] [ 11]
Understanding the data and its limitations
Each row of the table represents the best available information cross-checked from multiple sources on the day it was reported. The data may be inaccurate for the following reasons:[citation needed ]
Each data source or report may or may not include suspected cases that have not yet been confirmed.
Each source or report may or may not include probable cases.
Case numbers may be revised downward if a probable or suspected case is later found to be negative. (Numbers may differ from reports as per respective Government reports. See notes at the bottom for stated source file.)
The reports usually refer to cumulative data totals since the start of the 2014 epidemic. When new data becomes available or old data is revised the correction could apply either to the past or the present.
The number of deaths may be revised downwards if it is later found from testing those deaths were not from Ebola.
There are variable delays in gathering, correcting and reporting the data from multiple sources.
It is not possible to infer the rate of growth or decline in the spread of the disease from the cumulative data or the graphs; they simply reflect a timeline of the available data as reported on any given date. The real-world spread could be slowing while reported cumulative cases rise at a faster rate due to improved reporting, or the real-world spread could be increasing with flat cumulative data due to lack of reporting.
Graphs
Cumulative totals of cases and deaths over time
Cumulative totals in log scale
Cases per day in linear scale
Cumulative number of cases by country, using a linear scale
Cumulative number of cases by country, using a logarithmic scale
Cases based on population, using a linear scale
Cases based on population, using a logarithmic scale
Weekly cases, total and per country
Tables
Major Ebola virus outbreaks by country and by date – 30 July 2015 to most recent WHO / Gov update
Note : Cases include confirmed, probable and suspected per the WHO, numbers are the cumulative figures as published on the given date , and due to retrospective revisions differences between successive weekly totals are not necessarily the number of new cases that week.
Date
Total
Guinea
Liberia
Sierra Leone
Sources
Cases
Deaths
Cases
Deaths
Cases
Deaths
Cases
Deaths
25 Nov 2015
28,637
11,314
3,804
2,536
10,675
4,808
14,122
3,955
[ note 1] [ 13]
18 Nov 2015
28,634
11,314
3,804
2,536
10,672
4,808
14,122
3,955
[ note 2] [ 14]
11 Nov 2015
28,635
11,314
3,805
2,536
10,672
4,808
14,122
3,955
[ note 3] [ 15]
4 Nov 2015
28,607
11,314
3,810
2,536
10,672
4,808
14,089
3,955
[ note 4] [ 16]
25 Oct 2015
28,539
11,298
3,806
2,535
10,672
4,808
14,061
3,955
[ note 5] [ 17]
18 Oct 2015
28,476
11,298
3,803
2,535
10,672
4,808
14,001
3,955
[ 18]
11 Oct 2015
28,454
11,297
3,800
2,534
10,672
4,808
13,982
3,955
[ note 6] [ 19]
27 Sep 2015
28,388
11,296
3,805
2,533
10,672
4,808
13,911
3,955
[ 20]
20 Sep 2015
28,295
11,295
3,800
2,532
10,672
4,808
13,823
3,955
[ 21]
13 Sep 2015
28,220
11,291
3,792
2,530
10,672
4,808
13,756
3,953
[ 22]
6 Sep 2015
28,147
11,291
3,792
2,530
10,672
4,808
13,683
3,953
[ 23]
30 Aug 2015
28,073
11,290
3,792
2,529
10,672
4,808
13,609
3,953
[ 24]
16 Aug 2015
27,952
11,284
3,786
2,524
10,672
4,808
13,494
3,952
[ 25]
9 Aug 2015
27,929
11,283
3,787
2,524
10,672
4,808
13,470
3,951
[ 26]
26 Jul 2015
27,748
11,279
3,786
2,520
10,672
4,808
13,290
3,951
[ 27]
12 Jul 2015
27,642
11,261
3,760
2,506
10,673
4,808
13,209
3,947
[ 28]
5 Jul 2015
27,573
11,246
3,748
2,499
10,670
4,807
13,155
3,940
[ note 7] [ 29] [ 30]
28 Jun 2015
27,514
11,220
3,729
2,482
10,666
4,806
13,119
3,932
[ 31]
21 Jun 2015
27,443
11,207
3,718
2,473
10,666
4,806
13,059
3,924
[ 32]
14 Jun 2015
27,305
11,169
3,674
2,444
10,666
4,806
12,965
3,919
[ 33]
31 May 2015
27,110
11,132
3,652
2,429
10,666
4,806
12,827
3,912
[ 34]
17 May 2015
26,898
11,105
3,635
2,407
10,666
4,806
12,632
3,907
[ 35]
3 May 2015
26,558
10,990
3,589
2,386
10,564
4,716
12,440
3,903
[ 36]
19 Apr 2015
26,009
10,793
3,565
2,358
10,212
4,573
12,267
3,877
[ 37]
5 Apr 2015
25,480
10,557
3,515
2,333
9,862
4,408
12,138
3,831
[ 38]
22 Mar 2015
24,837
10,296
3,429
2,263
9,602
4,301
11,841
3,747
[ 39]
8 Mar 2015
24,282
9,976
3,285
2,170
≥9,343
≥4,162
11,619
3,629
[ 40]
22 Feb 2015
23,659
9,574
3,155
2,091
9,238
4,037
11,301
3,461
[ 41]
8 Feb 2015
22,824
9,147
3,044
1,995
≥8,881
≥3,826
10,934
3,341
[ 42]
25 Jan 2015
22,022
8,780
2,917
1,910
8,622
3,686
10,518
3,199
[ 43]
11 Jan 2015
21,226
8,399
2,806
1,814
8,331
3,538
10,124
3,062
[ 44]
28 Dec 2014
20,171
7,890
2,707
1,709
8,018
3,423
9,446
2,758
[ 45]
14 Dec 2014
18,565
7,273
2,415
1,525
7,819
3,346
8,356
2,417
[ 46] [ 47] [ 48]
30 Nov 2014
17,110
6,397
2,164
1,325
7,653
3,157
7,312
1,915
[ 49] [ 50] [ 51]
18 Nov 2014
15,291
5,765
2,047
1,214
7,082
2,963
6,190
1,598
[ 52] [ 53]
2 Nov 2014
13,015
5,188
1,731
1,041
6,525
2,697
4,759
1,450
[ 54] [ 55]
19 Oct 2014
9,911
4,890
1,540
926
4,665
2,705
3,706
1,259
[ 56]
12 Oct 2014
8,950
4,476
1,472
843
4,249
2,458
3,252
1,183
[ 57]
28 Sep 2014
7,169
3,278
1,157
710
3,696
1,998
2,317
570
[ 58] [ 59]
14 Sep 2014
5,327
2,578
942
601
2,720
1,461
1,655
516
[ 60] [ 61] [ 62]
31 Aug 2014
3,664
1,794
771
494
1,698
871
1,216
436
[ 63] [ 64]
16 Aug 2014
2,225
1,225
543
394
834
466
848
365
[ 65]
9 Aug 2014
1,835
1,011
506
373
599
323
730
315
[ 66]
30 Jul 2014
1,437
825
472
346
391
227
574
252
[ 67]
23 Jul 2014
1,201
672
427
319
249
129
525
224
[ 68]
14 Jul 2014
982
613
411
310
174
106
397
197
[ 69]
2 Jul 2014
779
481
412
305
115
75
252
101
[ 70]
17 Jun 2014
528
337
398
264
33
24
97
49
[ 71]
27 May 2014
309
202
281
186
12
11
16
5
[ 72]
12 May 2014
260
182
248
171
12
11
–
–
[ 73] [ 74]
1 May 2014
239
160
226
149
13
11
–
–
[ 75]
14 Apr 2014
176
110
168
108
8
2
–
–
[ 76]
31 Mar 2014
130
82
122
80
8
2
–
–
[ 77]
22 Mar 2014
49
29
49
29
–
–
–
–
[ 78]
Minor Ebola virus outbreaks by country and by date – 30 July 2014 to most recent WHO / Gov update
Date
Total
Nigeria
Senegal
USA
Spain
Mali
U.K.
Italy
Refs
Cases
Deaths
Cases
Deaths
Cases
Deaths
Cases
Deaths
Cases
Deaths
Cases
Deaths
Cases
Deaths
Cases
Deaths
4 Nov 2015
36
15
20
8
1
0
4
1
1
0
8
6
1
0
1
0
[ note 8] [ 24]
13 May 2015
36
15
20
8
1
0
4
1
1
0
8
6
1
0
1
0
[ note 9] [ 79]
29 Dec 2014
35
15
20
8
1
0
4
1
1
0
8
6
1
0
–
–
[ note 10] [ 45]
14 Dec 2014
32
15
20
8
1
0
4
1
1
0
6
6
–
–
–
–
[ 46]
2 Nov 2014
27
10
20
8
1
0
4
1
1
0
1
1
–
–
–
–
[ 54]
19 Oct 2014
25
9
20
8
1
0
3
1
1
0
-
–
–
–
–
–
[ 56]
12 Oct 2014
23
8
20
8
1
0
1
0
1
0
-
–
–
–
–
–
[ 57]
28 Sep 2014
22
8
20
8
1
0
1
0
-
–
-
–
–
–
–
–
[ 58]
31 Aug 2014
22
7
21
7
1
0
–
–
-
–
-
–
–
–
–
–
[ 63]
16 Aug 2014
15
4
15
4
–
–
-
–
-
–
-
–
–
–
–
–
[ 65]
9 Aug 2014
13
2
13
2
–
–
-
–
-
–
–
–
–
–
–
–
[ 66]
30 Jul 2014
3
1
3
1
–
–
–
–
-
–
–
–
–
–
–
–
[ 67]
Notes:
^ 25 Nov: All governments as per WHO.
^ 18 Nov: All governments as per WHO.
^ 11 Nov: All governments as per WHO.
^ 4 Nov: All governments as per WHO.
^ 25 Oct: All governments as per WHO.
^ 30 Aug: All governments as per WHO.
^ 5 July: All governments as per WHO. Liberia as per situation update
^ No chance in Data from 13 May till 4 Nov
^ No chance in Data from 29 December till 13 May
^ 29 December: All governments as per WHO. United Kingdom case dated 29 December.
Date is the "as of" date from the reference. A single source may report statistics for multiple "as of" dates.
Total cases and deaths before 1 July 2014 are calculated.
Numbers with ≥ may not be consistent due to under reporting.
References
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Further reading
External links
Resources