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- * List of all MMWR reports on COVID-19
Per the CDC website
- *Presymptomatic Transmission of SARS-CoV-2 — Singapore, January 23–March 16, 2020
Wei WE, Li Z, Chiew CJ, Yong SE, Toh MP, Lee VJ. Presymptomatic Transmission of SARS-CoV-2 — Singapore, January 23–March 16, 2020. MMWR Morb Mortal Wkly Rep. ePub: 1 April 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6914e1external icon
Investigation of all 243 cases of COVID-19 reported in Singapore during January 23–March 16 identified seven clusters of cases in which presymptomatic transmission is the most likely explanation for the occurrence of secondary cases.
- *Public Health Responses to COVID-19 Outbreaks on Cruise Ships — Worldwide, February–March 2020
"The results of testing of passengers and crew on board the Diamond Princess demonstrated a high proportion (46.5%) of asymptomatic infections at the time of testing. Available statistical models of the Diamond Princess outbreak suggest that 17.9% of infected persons never developed symptoms (9). A high proportion of asymptomatic infections could partially explain the high attack rate among cruise ship passengers and crew. SARS-CoV-2 RNA was identified on a variety of surfaces in cabins of both symptomatic and asymptomatic infected passengers up to 17 days after cabins were vacated on the Diamond Princess but before disinfection procedures had been conducted (Takuya Yamagishi, National Institute of Infectious Diseases, personal communication, 2020). Although these data cannot be used to determine whether transmission occurred from contaminated surfaces, ..."
- 2020-06-30 - Characteristics of Adult Outpatients and Inpatients with COVID-19 — 11 Academic Medical Centers, United States, March–May 2020
Mark W. Tenforde, MD, PhD; Erica Billig Rose, PhD; Christopher J. Lindsell, PhD; Nathan I. Shapiro, MD, et al. MMWR Morb Mortal Wkly Rep. ePub: 30 June 2020.
In a multistate telephone survey of 350 adult inpatients and outpatients who tested positive for SARS-CoV-2 infection, only 46% reported recent contact with a COVID-19 patient. Most participants’ contacts were a family member (45%) or a work colleague (34%). Two thirds of participants were employed; only 17% were able to telework.
- 2020-06-30 - Exposures Before Issuance of Stay-at-Home Orders Among Persons with Laboratory-Confirmed COVID-19 — Colorado, March 2020
Kristen Marshall, PhD; Grace M. Vahey, DVM; Emily McDonald, MD; Jacqueline E. Tate, PhD; et al. MMWR Morb Mortal Wkly Rep. ePub: 30 June 2020.
Among all participants, 99 (27%) reported known contact with at least one person with laboratory-confirmed COVID-19 (Figure); the most commonly reported relationships to potential source patients were a family member (27; 27%) and a coworker (25; 25%). Approximately three quarters of participants reported that their exposure to a known COVID-19 contact occurred in the workplace (47; 47%) or the household (24; 24%). Among the 47 participants who reported workplace exposure, most were health care personnel (28; 60%), followed by workers in public administration or the armed forces (six; 13%), and those working in a manufacturing setting (five; 11%).
- Characteristics and Clinical Outcomes of Adult Patients Hospitalized with COVID-19 — Georgia, March 2020
Gold JA, Wong KK, Szablewski CM, et al. MMWR Morb Mortal Wkly Rep. ePub: 29 April 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6918e1
In a cohort of 305 hospitalized adults with COVID-19 in Georgia (primarily metropolitan Atlanta), black patients were overrepresented, and their clinical outcomes were similar to those of nonblack patients. One in four hospitalized patients had no recognized risk factors for severe COVID-19.
- Community Transmission of SARS-CoV-2 at Two Family Gatherings — Chicago, Illinois, February–March 2020
Isaac Ghinai; Susan Woods; Kathleen A. Ritger; Tristan D. McPherson; et al. MMWR Morb Mortal Wkly Rep. ePub: 8 April 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6915e1
Investigation of COVID-19 cases in Chicago identified a cluster of 16 confirmed or probable cases, including three deaths, likely resulting from one introduction. Extended family gatherings including a funeral and a birthday party likely facilitated transmission of SARS-CoV-2 in this cluster.
- COVID-19 in a Long-Term Care Facility — King County, Washington, February 27–March 9, 2020
McMichael TM, Clark S, Pogosjans S, et al. COVID-19 in a Long-Term Care Facility — King County, Washington, February 27–March 9, 2020. MMWR Morb Mortal Wkly Rep 2020;69:339-342. DOI: http://dx.doi.org/10.15585/mmwr.mm6912e1
- COVID-19 Monitoring and Response Among U.S. Air Force Basic Military Trainees — Texas, March–April 2020
Marcus JE, Frankel DN, Pawlak MT, et al. MMWR Morb Mortal Wkly Rep. ePub: 2 June 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6922e2external icon
During March 1–April 18, a total of 4,073 incoming trainees joined 6,506 trainees who had already started BMT. Five cases of COVID-19 were diagnosed among incoming recruits, including three cases of transmission within JBSA (cumulative incidence = 47 per 100,000 persons). A combination of administrative controls, increased testing, and quarantine and isolation allowed military training to continue, albeit with 40% reduced numbers, during the first months of the COVID-19 pandemic. (Note: all five SARS-CoV-2 positive cases were among the 4,073 incoming trainees (122.8/100,000)
- Evidence for Limited Early Spread of COVID-19 Within the United States, January–February 2020
Michelle A. Jorden, MD; Sarah L. Rudman, MD; Elsa Villarino, MD; Stacey Hoferka, MPH, MSIS, et al. MMWR / June 5, 2020 / 69(22);680–684
Four separate lines of evidence (syndromic surveillance, virus surveillance, phylogenetic analysis, and retrospectively identified cases) suggest that limited U.S. community transmission likely began in late January or early February 2020, after a single importation from China, followed by multiple importations from Europe. Until late February, COVID-19 incidence was too low to be detected by emergency department syndromic surveillance for COVID-19–like illness.
- High COVID-19 Attack Rate Among Attendees at Events at a Church — Arkansas, March 2020
Allison James, DVM, PhD; Lesli Eagle; Cassandra Phillips; D. Stephen Hedges, MPH; Cathie Bodenhamer; Robin Brown, MPAS, MPH; J. Gary Wheeler, MD; Hannah Kirking, MD
MMWR / May 22, 2020 / 69(20);632–635
Among 92 attendees at a rural Arkansas church during March 6–11, 35 (38%) developed laboratory-confirmed COVID-19, and three persons died. Highest attack rates were in persons aged 19–64 years (59%) and ≥65 years (50%). An additional 26 cases linked to the church occurred in the community, including one death.
- High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice — Skagit County, Washington, March 2020
Lea Hamner, MPH; Polly Dubbel, MPH; Ian Capron; Andy Ross, MPH; Amber Jordan, MPH; Jaxon Lee, MPH; Joanne Lynn; Amelia Ball; Simranjit Narwal, MSc; Sam Russell; Dale Patrick; Howard Leibrand, MD
MMWR Early Release / May 12, 2020
- Hospitalization Rates and Characteristics of Patients Hospitalized with Laboratory-Confirmed Coronavirus Disease 2019 — COVID-NET, 14 States, March 1–30, 2020
Shikha Garg; Lindsay Kim; Michael Whitaker; Alissa O’Halloran; et al. MMWR Morb Mortal Wkly Rep. ePub: 8 April 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6915e3
- Potential Indirect Effects of the COVID-19 Pandemic on Use of Emergency Departments for Acute Life-Threatening Conditions — United States, January–May 2020
Samantha J. Lange, MPH; Matthew D. Ritchey, DPT; Alyson B. Goodman, MD; Taylor Dias, et al. Morbidity and Mortality Weekly Report Early Release / Vol. 69 June 22, 2020
In the 10 weeks following declaration of the COVID-19 national emergency, ED visits declined 23% for heart attack, 20% for stroke, and 10% for hyperglycemic crisis.
- Preliminary Estimate of Excess Mortality During the COVID-19 Outbreak — New York City, March 11–May 2, 2020
MMWR Morb Mortal Wkly Rep. ePub: 11 May 2020. DOI: http://dx.doi.org/10.15585/mmwr.mm6919e5
- SARS-CoV-2 Infections and Serologic Responses from a Sample of U.S. Navy Service Members — USS Theodore Roosevelt, April 2020
Daniel C. Payne, PhD; Sarah E. Smith-Jeffcoat, MPH; Gosia Nowak, MPH; Uzo Chukwuma, MPH, et al. MMWR Morb Mortal Wkly Rep. ePub: 9 June 2020
Among a convenience sample of 382 young adult U.S. service members aboard an aircraft carrier experiencing a COVID-19 outbreak, 60% had reactive antibodies, and 59% of those also had neutralizing antibodies at the time of specimen collection. One fifth of infected participants reported no symptoms. Preventive measures, such as using face coverings and observing social distancing, reduced risk for infection.
- Serial Laboratory Testing for SARS-CoV-2 Infection Among Incarcerated and Detained Persons in a Correctional and Detention Facility — Louisiana, April–May 2020
Henry Njuguna, MD; Megan Wallace, DrPH; Sean Simonson, MPH; Farrell A. Tobolowsky, DO, et al. MMWR Morb Mortal Wkly Rep. ePub: 29 June 2020.
Testing among quarantined contacts of patients with COVID-19 in a correctional and detention facility identified a high proportion of asymptomatic and presymptomatic cases that were not identified through symptom screening alone. Approximately one fourth of cases were found through serial testing during quarantine.
- Universal and Serial Laboratory Testing for SARS-CoV-2 at a Long-Term Care Skilled Nursing Facility for Veterans — Los Angeles, California, 2020
Amy V. Dora, MD; Alexander Winnett; Lauren P. Jatt; Kusha Davar; Mika Watanabe; Linda Sohn, MD; Hannah S. Kern, MD; Christopher J. Graber, MD; Matthew B. Goetz, MD. Morb Mortal Wkly Rep. May 29, 2020 / 69(21);651–655.
Many SNF residents and staff members identified with COVID-19 are asymptomatic and presymptomatic.