Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year ...

The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast. (Carl Zimmer)

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Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.

Carl Zimmer Quotes: The reason that viruses are so hard to fight, the reason for example we need a flu virus every year is that they evolve very fast.