Articles

Plain-language articles on how viral genomes are sequenced, how variants arise and how scientists track them. For the virology primer, see the home page.

• From Swab to Sequence: How Viral Genomes Are Read
  How does a nasal swab turn into a readable viral genome? A step-by-step look at the lab and computing work behind every variant sequence.
• Wastewater Surveillance: Tracking Variants Through Sewage
  Sewage carries traces of viral RNA from whole communities. Here is how wastewater monitoring works and why it became a key tool for watching variants.
• How Mutations Arise: Mutation, Recombination and Selection
  New variants do not appear out of nowhere. This explainer covers the core forces behind viral change: copying errors, recombination, drift and selection.
• How to Read a Viral Family Tree: Phylogenetics Basics
  Variant reports are full of branching trees. This guide explains what branches, nodes and clades mean, and the most common ways people misread them.
• Convergent Evolution: Why Variants Evolve the Same Mutations
  Different variant lineages often land on the same mutations independently. Here is what convergent evolution is and what it says about immune escape.