Government and World Bodies

Centres for Disease Control and Prevention
World Health Organisation
National Institute of Health

Johns Hopkins University of Medicine Corona Virus Resource Center

Journal Resources (Free COVID-19 content)

The Lancet - Resource Centre
The New England Journal of Medicine - Special Topics

Vaccine FAQs - New England Journal of Medicine

Guidelines and Position Statements

UIP Position Statement

Triage of Patients With Venous and Lymphatic Diseases During the COVID-19 Pandemic- The Venous and Lymphatic Triage and Acuity Scale (VELTAS). 
Published in Phlebology and The Journal of Vascular Surgery: Venous and Lymphatic Disorders
A position statement of the International Union of Phlebology (UIP), Australasian College of Phlebology (ACP), American Vein and Lymphatic Society (AVLS), American Venous Forum (AVF), European College of Phlebology (ECoP), European Venous Forum (EVF), Interventional Radiology Society of Australasia (IRSA), Latin American Venous Forum, Pan-American Society of Phlebology and Lymphology and the Venous Association of India (VAI)

International Society of Thrombosis and Haemostasis

Clinical Guidance on the Diagnosis, Prevention and Treatment of Venous Thromboembolism in Hospitalized Patients with COVID-19

Despite not being written with Phlebology specifically in mind, a number of bodies have developed a number of useful resources that may assist you

World Federation for Ultrasound in Medicine and Biology (WFUMB):

How to perform a safe ultrasound examination and clean equipment in the context of COVID-19

International Society of Ultrasound in Obstetrics and Gynaecology:

ISUOG Position Statement
Webinar series on COVID-19 (Including topics such as how to clean your equipment properly)
Resources in French, German, Romanian, Portuguese, Chinese, Italian, Spanish, Ukrainian and Czech