Draft search strategy (showing potential expansions)
Ovid MEDLINE(R) ALL <1946 to June 25, 2020>
1	exp Coronavirus/	18064
2	exp Coronavirus Infections/	17627
3	(coronavirus* or corona virus* or OC43 or NL63 or 229E or HKU1 or HCoV* or ncov* or covid* or sars-cov* or sarscov* or Sars-coronavirus* or Severe Acute Respiratory Syndrome Coronavirus*).mp.	42030
4	(or/1–3) and ((20191* or 202*).dp. or 20190101:20301231.(ep).) [this set is the sensitive/broad part of the search]	29010
5	4 not (SARS or SARS-CoV or MERS or MERS-CoV or Middle East respiratory syndrome or camel* or dromedar* or equine or coronary or coronal or covidence* or covidien or influenza virus or HIV or bovine or calves or TGEV or feline or porcine or BCoV or PED or PEDV or PDCoV or FIPV or FCoV or SADS-CoV or canine or CCov or zoonotic or avian influenza or H1N1 or H5N1 or H5N6 or IBV or murine corona*).mp. [line 5 removes noise in the search results]	19068
6	((pneumonia or covid* or coronavirus* or corona virus* or ncov* or 2019-ncov or sars*).mp. or exp pneumonia/) and Wuhan.mp.	1860
7	(2019-ncov or ncov19 or ncov-19 or 2019-novel CoV or sars-cov2 or sars-cov-2 or sarscov2 or sarscov-2 or Sars-coronavirus2 or Sars-coronavirus-2 or SARS-like coronavirus* or coronavirus-19 or covid19 or covid-19 or covid 2019 or ((novel or new or nouveau) adj2 (CoV on nCoV or covid or coronavirus* or corona virus or Pandemi*2)) or ((covid or covid19 or covid-19) and pandemic*2) or (coronavirus* and pneumonia)).mp.	29081
8	COVID-19.rx,px,ox. or severe acute respiratory syndrome coronavirus 2.os.	8075
9	(“32240632” or “32236488” or “32268021” or “32267941” or “32169616” or “32267649” or “32267499” or “32267344” or “32248853” or “32246156” or “32243118” or “32240583” or “32237674” or “32234725” or “32173381” or “32227595” or “32185863” or “32221979” or “32213260” or “32205350” or “32202721” or “32197097” or “32196032” or “32188729” or “32176889” or “32088947” or “32277065” or “32273472” or “32273444” or “32145185” or “31917786” or “32267384” or “32265186” or “32253187” or “32265567” or “32231286” or “32105468” or “32179788” or “32152361” or “32152148” or “32140676” or “32053580” or “32029604” or “32127714” or “32047315” or “32020111” or “32267950” or “32249952” or “32172715”).ui. [Articles not captured by this search when created in April 2020, pending further indexing by NLM]	50
10	or/6–9 [Lines 6 to 9 are specific to Covid-19]	29152
11	5 or 10	30228
12	11 and 20191201:20301231.(dt).	28113
13	(covid* or ncov* or 2019-novel CoV or SARS-CoV2 or SARS-CoV-2 or SARSCoV2 or SARSCov-2 or “severe acute respiratory syndrome coronavirus 2”).mp.	27537
14	(coronavirus* or corona virus*).mp. and 2020*.dp.	16570
15	((novel or new or “2019” or “19” or pandemic or crisis or outbreak or Wuhan or China) adj3 (coronavirus* or corona virus*)).mp.	9668
16	Covid-19.rx.	7963
17	coronavirus infections/ and 2020*.dp.	8100
18	Pneumonia, Viral/ and 2020*.dp.	7981
19	or/13–18	29822
20	12 or 19	29897
21	(specimen* or swab* or sample or samples or sampling or wash or aspirate or aspirates).mp.	2271408
22	(nasal or nasopharyngeal or tongue or saliva or transoral or transnasal or oropharyngeal or pharyngeal or nasopharynx or oropharynx or nares or rhinopharyngeal or rhinopharynx or turbinate).mp.	326472
23	(NP or NPS or OP or OPS or MTS or NMT).mp.	100147
24	(sputum or oral or buccal or mouth or nose or drool or gingival or gargle).mp.	915864
25	coronavirus infections/di or severe acute respiratory syndrome/di or COVID-19 diagnostic testing.px.	2766
26	saliva/ or sputum/ or exp nose/ or exp pharynx/	194669
27	25 and 26	138
28	specimen handling/	28054
29	21 or 22 or 23 or 24 or 27 or 28	3357925
30	20 and 29 and ((20191* or 202*).dp. or 20190101:20301231.(ep).) [start screening this set]	2373
31	[potential expansions 1 and 2: sensitivity terms, with or without PCR terms]	0
32	(sensitiv* or specific* or perform* or accura* or precis* or compar* or predictive value or ROC curve or index test* or LoD or limit* of detection or utility).mp.	11634892
33	exp sensitivity/ and specificity/	346232
34	exp Polymerase Chain Reaction/st	3775
35	specimen handling/st	2055
36	reference standards/	42192
37	exp reproducibility of results/	399804
38	or/32–37	11725122
39	exp polymerase Chain Reaction/ or molecular diagnostic techniques/	454902
40	(PCR or polymerase chain reaction or molecular).mp.	3026943
41	39 or 40	3029592
42	38 and 41 [sensitivity terms AND PCR terms]	1657426
43	20 and (29 or 42) and ((20191* or 202*).dp. or 20190101:20301231.(ep).) [COVID-19 + sample collection or sensitivity, but only if sensitivity comes along with PCR]	2971
44	20 and (29 or 41) and ((20191* or 202*).dp. or 20190101:20301231.(ep).) [COVID-19 + sample collection or sensitivity]	3652
45	[potential expansion 3: diagnosis terms]	0
46	(diagnosis or diagnostic or screening or testing or screen* or test* or surveillance).mp.	8250322
47	coronavirus infections/di or severe acute respiratory syndrome/di or COVID-19 diagnostic testing.px.	2766
48	20 and (29 or 41 or 46 or 47) and ((20191* or 202*).dp. or 20190101:20301231.(ep).)	8104