Table 1.
Determination of anti-S, anti-N antibodies, and SARS-CoV-2 RNA in maternal and umbilical cord blood samples and SARS-CoV-2 RNA in placental tissues
| Samples | |
| Maternal blood serum | |
| Antibodies concentration | |
| Anti-S antibodies | 5.5 BAU/ml |
| Anti-N antibodies | 0.3 U/ml |
| PCR results (Ct) | |
| Gene N | Negative |
| Gene Ea | Negative |
| RdRp | Negative |
| Umbilical cord blood serum (Infant 1) | |
| Antibodies concentration | |
| Anti-S antibodies | 0.088 BAU/ml |
| Anti-N antibodies | 0.4 U/ml |
| PCR results (Ct) | |
| Gene N | 37,000b |
| Gene Ea | 33,871b |
| RdRp | Negative |
| Umbilical cord blood serum (Infant 2) | |
| Antibodies concentration | |
| Anti-S antibodies | 0.087 BAU/ml |
| Anti-N antibodies | 0.4 U/ml |
| PCR results (Ct) | |
| Gene N | 35,488b |
| Gene Ea | 34,418b |
| RdRp | Negative |
| Placental tissues | |
| PCR results (Ct) | |
| Gene N | 35,582b |
| Gene Ea | Negative |
| RdRp | Negative |
a
Gene E is not specific toward SARS-CoV-2 but is present in all Coronavirus.
b
Ct, positive if ≤ 38.
BAU: binding antibodies unit; Ct: Cycle threshold; N, nucleocapsid; PCR, polymerase chain reaction; RdRp, RNA-dependent RNA polymerase; S, spike.