NIH regularly updates its resources on the COVID-19: Information for NIH Applicants & Recipients of NIH Funding webpage. In addition to new funding opportunities, below is a round-up of what you can find:

• Info for NIH applicants/recipients (PowerPoint)
• FAQs foreign components, animal welfare, continuous submission, reference letters, salaries, donating PPEs, prior approval, contracts, training, fellowship awards
• Specific FAQ changes, go to page update history
•  Pandemic Contingency Planning for Animal Care & Use Programs
• OHRP Guidance 
• Virtual NIH Activities for Trainees Outside the NIH
• FAQs on Flexibilities