Question

below, rank the following vaccine candidates studied in june 2020 from most advanced in development to least advanced in development.
a new vaccine is extensively tested:
the first trials are performed on animals or cell lines (collections of identical cells).
three phases of clinical trials are conducted on adult human volunteers.
if the vaccine proves to be safe and effective, the fda approves it for commercial sale.
takis biotech: developing five dna - based vaccine candidates based on the spike protein of covid - 19; each contains pcr (polymerase chain reaction) - produced pieces of linear dna instead of traditional circular plasmids; vaccines could be quickly produced
moderna: reported successful animal antibody response and positive response in the initial group of 45 human volunteers; testing an additional 600 human volunteers and recruiting the next group of 30,000 human volunteers
oxford university/astrazeneca: reported successful antibody response in monkeys; tested 1,100 adult human volunteers initially; began testing on two groups of 10,000 human volunteers simultaneously; reported data for the 10,000 - person group limited to subjects 18 years of age and older
medicago: rapidly developing plant - based vaccine; previously successful with flu vaccine; reported positive antibody results in mice; recruiting human volunteers
start by choosing the first item in the sequence and clicking, dragging, or using your keyboard to select it.
drag the items below into the box above in the correct order, starting with the first item in the sequence.

Explanation:

Based on progress in trials. Moderna and Oxford/AstraZeneca are in larger - scale human trials. Medicago is recruiting humans and Takis is still in development phase.

Answer:

1. Moderna
2. Oxford University/AstraZeneca
3. Medicago
4. Takis Biotech