From (answers to) a related question, the WHO had mostly changed their public stance on the human-to-human transmission of COVID-19 after Jan 22, while giving mostly "negative signals" on this matter of human-to-human transmission before Jan 22.
Interestingly, on Jan 17, the European Centre for Disease Prevention and Control (ECDC) put out a rapid report saying that:
The occurrence of a few cases having no history of contact with the implicated market or other any similar market suggests the possibility of the infection source being more widely distributed, or of human-to-human transmission similar to other coronaviruses such as SARS-CoV and MERS-CoV. The occurrence of a few family clusters also supports this latter hypothesis. However, there is currently no knowledge on the transmission mode or risk factors for transmission. Furthermore, there is no information on the disease spectrum or risk factors for severity. In light of these unknowns, we cannot exclude the possibility of low-level virus circulation in the Wuhan community and thus the possibility of other clusters occurring in the near future. [...]
- There is a high likelihood of case importation in countries with the greatest volume of people travelling to and from Wuhan (i.e. countries in Asia).
- There is a low likelihood of importation of cases in EU/EEA countries, due to the less extensive traffic of people with Wuhan.
For comparison, what did the US CDC say on this matter (human-to-human transmission) within this period (i.e between Jan 14 and 21), and did they also asses back then (like the ECDC did) the likelihood of importation into the US?
Insofar I was able to find, by Jan 31, the US CDC was clearly convinced of human-to-human transmission:
On January 31, 2020, CDC published updated PUI guidance (8) in response to the evolving global epidemiology of 2019-nCoV, including the rapid geographic expansion and documentation of person-to-person transmission (9). Updated guidance emphasizes 2019-nCoV testing for symptomatic persons in close contact with patients with laboratory-confirmed 2019-nCoV infection, persons returning from Hubei province in addition to Wuhan City, and persons from mainland China requiring hospitalization because of fever and lower respiratory tract illness. Additional refinements to this approach likely will be needed in the future as understanding of 2019-nCoV epidemiology continues to improve.
But what did they say roughly two weeks earlier, before the WHO had confirmed human-to-human transmission?