Should I worry about cross-contact or cross-contamination inside food production factories?

I live in Portugal. Here are some supermarket chains such as "Continente", "Pingo Doce" etc. They sell their own brand foods and also other brands' foods. For instance: Continente sells vegetable salads, vegetable sandwich, vegetable soups etc. They do NOT have "suitable for vegetarians" label. Their ingredient lists don't seem to have any animal-derived or Haram ingredients. But I have a concern. Do I need to know, whether there is any **cross-contact** (or cross-contamination) between vegetarian and non-vegetarian foods in the Continente food factories? What usually happens in these kind of factories? Please help....