INTRODUCTION: The spread of coronavirus disease 2019 (COVID-19) is controlled by timely detection of infected patients using a nasopharyngeal (NP) swab test, followed by isolation and treatment. One challenge encountered with NP swab collection was to train healthcare providers (HCPs) with different training backgrounds and experience for collecting NP swab specimens across Nebraska, including a sizeable rural area. In-person training for NP swab collection skills was challenging due to social distancing. We developed a Just-In-Time-Online Training (JITOT) and delivered it using Facebook Live (TM) to meet our HCPs' training needs. METHODS: Online training was held on April 21, 2020, and attended by 453 HCPs. A quasi-experimental study based on a survey and a multiple choice questionnaire (MCQ) was conducted to evaluate its effectiveness in improving the participants' knowledge and attitudes. RESULTS: Group mean knowledge score increased from a pre-test score of 57%-95% in the post-test showing a large effect size (Hedges' g = 0.976877). On a five-point Likert scale, the majority (86.21%) of the survey respondents agreed/strongly agreed that this training increased their overall comfort for nasal swab specimen collection as compared to their pre-training comfort (37.93%) with this procedure. The majority of respondents (96.55%) in the post-training evaluation agreed/strongly agreed that "the delivery method was appropriate." CONCLUSION: A JITOT session is helpful to teach, demonstrate, clarify doubts, and improve the knowledge and comfort of the participants. It can be quickly delivered using a free social media platform for broader outreach during public health emergencies.