[Avodah] Spontaneous Generation

[cantorwolberg at cox.net]

MBY 316:1-12 Forbidden and Permissible Trapping (abridged)
[Based heavily upon Kitzur Shulchan Aruch: 80:52-53 and 87:20-21, “Metsudah” edition, with notes, 
translated and annotated by Rabbi Avrohom Davis] 
Insects
80:52) It is forbidden even to catch a flea on Shabbos.  But if it is on your body and it is biting you, 
since it causes you physical discomfort, it may be removed and thrown away.  It is forbidden to kill it, 
because it is forbidden to kill any living creature on Shabbos.  (Footnote #162: In a place where many ants 
are found, one must be careful not to step on them - Shulchan Aruch Harav 316:21.)  Lice, however, since 
they are created only by perspiration, are permitted to be killed.  Nevertheless, those found in clothing must 
not be killed; rather, they should be removed and thrown away.  (Footnote #163: Because fleas are found 
there too and you may come to kill a flea - Magen Avraham)  Only lice found in the head may be killed.
80:53) You must take care when closing a box or vessel in which there are flies, to let them fly out first, 
because when you close it they will be trapped there.  However, it is not necessary to examine the box 
to see that none are left; it is sufficient to chase away those you see.

The above statement regarding lice created only by perspiration has been disproven and is no longer controversial. 
Would the above halacha permitting lice to be killed therefore be invalid? Or does any halacha which has been proven
to be based on faulty information still have to remain? (lo plug)   
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