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The duration of maternal immunity was determined from 112 lambs born from vaccinated ewes with the homologous PPR vaccine “Nigeria 75/1" at day 90 and day 120 of pregnancy. Serum samples were collected from lambs starting from day 15 to day 150 after birth and analyzed using the PPR specific competitive ELISA. At day 75 and day 90 after birth, 70% and 95% of these lambs respectively became negative. So it is recommended to vaccinate lambs against PPR in the interval from 75 to 90 days after birth.

Assessment of the duration of maternal antibodies specific to the homologous &lt;i&gt;peste des petits&lt;/i&gt; ruminant vaccine “Nigeria 75/1" in &lt;i&gt;Djallonké&lt;/i&gt; lambs