diff --git a/reject.txt b/reject.txt
index 46b634a7bec8d5691240a1d06998b2251a87bbf2..c90fb0a1f3aff22fa798bd8f7c0d0313b267f5e6 100644
--- a/reject.txt
+++ b/reject.txt
@@ -15,6 +15,7 @@ Tanzania
 Togo
 Tonga
 turkey
+USA
 
 
 ### Common English words
@@ -65,6 +66,7 @@ TeSt
 This
 unknown
 white
+C
 
 
 ### Excluded nodes
@@ -202,6 +204,30 @@ Delta
 Electron
 environmental samples
 clinical samples
+PCR
+III
+CD4
+type 2
+AMP
+Ser
+Ig[GM]
+ATCC
+lac
+MAC
+PHB
+MIP
+Hp
+VII
+MCF
+alpha 1
+C\d+
+PCA
+B12
+PKC
+Zn2
+H-2
+PAR
+Mol
 
 
 ### Obsolete