Family clustering occurred for all infected infants. 
Families of all 9 infants had at least one infected family member.
All infants' infections occurred after the family member's infection.

University of Michigan - Ann Arbor

Cluster transmission has been noted in many COVID-19 studies
It is characterized by infections that are concentrated within a given area, often within families or social circles 

Cluster Transmission of COVID-19

Wei, M., Yuan, J., Lui, Y., Fu, T., Yu, X., Zhang, Zhang, ZJ. (2020). Novel Coronavirus Infection in Hospitalized Infants Under 1 Year of Age in China. Journal of the American Medical Association, 323(13), 1313-1314.
https://doi.org/10.1001/jama.2020.2131 

https://jamanetwork.com/journals/jama/fullarticle/2761659

Novel Coronavirus Infection in Hospitalized Infants Under 1 Year of Age in China

Family Clustering of Cases of COVID-19 in Infants in China

Of the 262 patients, 176 (67.2%) were defined as clustered cases, 133 (50.8%) were considered family cluster cases, and 43 (16.4%) were classified as “other” clustered cases. Median cluster size was 3.

Clustering of COVID-19 Cases in Beijing, China

- At least 235 (56%) of 417 cases reported in Shenzhen were from clusters
- 80% of these clusters were among households


Cluster transmission in First-wave COVID-19 transmissibility and severity in China outside Hubei after control measures, and second-wave scenario planning: a modeling impact assessment

Cluster Transmission of COVID-19 References by Journal

- Asia
- Africa
- North America
- South America
- Antarctica
- Europe
- Australia

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