Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My NCBI Filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1965 1
1979 2
1980 6
1981 16
1982 10
1983 15
1984 16
1985 16
1986 15
1987 30
1988 41
1989 39
1990 38
1991 43
1992 70
1993 85
1994 89
1995 101
1996 135
1997 155
1998 122
1999 170
2000 180
2001 231
2002 241
2003 332
2004 434
2005 565
2006 698
2007 815
2008 871
2009 1051
2010 1169
2011 1379
2012 1660
2013 2001
2014 2290
2015 2598
2016 2695
2017 3032
2018 3407
2019 4070
2020 4838
2021 5434
2022 6482
2023 6312
2024 2979
2025 1

Text availability

Article attribute

Article type

Publication date

Search Results

50,928 results

Results by year

Filters applied: . Clear all
Page 1
SARS-CoV-2 Viral Load in the Nasopharynx at Time of First Infection Among Unvaccinated Individuals: A Secondary Cross-Protocol Analysis of 4 Randomized Trials.
Fisher LH, Kee JJ, Liu A, Espinosa CM, Randhawa AK, Ludwig J, Magaret CA, Robinson ST, Gilbert PB, Hyrien O, Kublin JG, Rouphael N, Falsey AR, Sobieszczyk ME, El Sahly HM, Grinsztejn B, Gray GE, Kotloff KL, Gay CL, Leav B, Hirsch I, Struyf F, Dunkle LM, Neuzil KM, Corey L, Huang Y, Goepfert PA, Walsh SR, Baden LR, Janes H; COVID-19 Prevention Network (CoVPN). Fisher LH, et al. JAMA Netw Open. 2024 May 1;7(5):e2412835. doi: 10.1001/jamanetworkopen.2024.12835. JAMA Netw Open. 2024. PMID: 38780941
50,928 results
You have reached the last available page of results. Please see the User Guide for more information.