Pictures of this coronavirus have been published, and several details about its morphology, including a size around 120 nm.
My questions are:
What is the weight of a single COVID-19 virus? Can we assume a density similar to water leading to a weight of 4/3*PI*120nm^3 / 1000 = 4.2 10-21 g if I'm not mistaken?
Approximately how many viruses of this type are present in the body of someone infected (including asymptomatic carrier), and thus what is the average weight per person?
This page states It has been estimated that there are over 380 trillion viruses inhabiting us, a community collectively known as the human virome
However, it focuses on harmless viruses and healthy people. I haven't found numbers related to someone infected by a virus.
How does this compares to poisons1? This article about the deadliest one, botulinum toxin, states: Extrapolating from its effect on mice, an intravenous dose of just 10⁻⁷g would be fatal to a 70kg person.
1 I understand it can't easily compare with poisons as a poison doesn't duplicates itself inside a body and the immune system, hopefully, plays a role here.