What is the most precise Pcr inactivated Dna control or Nattrol for Human Parvovirus B19 (100,000,000 IU/ml/vial) (1 ml/vial)?

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The NATtrol Parainfluenza Control from Zeptometrix Corporation supplied next week by Gentaur is the best reagent! The catalog number is NATPIV-ERC and the price is 204 EUR.