Cockroaches are a dangerous and severe threats to human health. They defecate where they eat and can cause serious bowel issues. When they grow they shed tiny pieces of their carapace that can float in the air, this can be inhaled and cause lung infections as they are coated in dangerous bacteria. Because cockroaches can live in sewer systems they can also cause sepsis. Cockroaches are very old insects and have internal organs unlike other insects, they lay eggs that are in a sack called an Ootheca that must be protected from their organs as they lay it through the same passageway that food passes through. This would dissolve the eggs on their own. They are a physical danger to human health and must be treated right away or they could cause lasting damage to the health of the inhabitants. Cockroaches of different species can have different numbers of eggs in their ootheca. Larger cockroaches like the American cockroach have only four or five baby cockroaches in one egg sack. This is consistent for most cockroach species except the german cockroach whose egg sack can house up to sixty eggs. This means the german cockroach is a much more virulent infestation and a much harder infestation to treat.
This is often why some people will have cockroaches, get treatment and they will be gone just like that. And then someone else gets treatment and the exterminator technician has to come back and do it four more times and they still end up seeing some. This is because cockroaches come from different species with different birth rates and may have been in that place for longer times. For instance, if you live in a detached house then your cockroaches may be treated with only one treatment. If you live in an attached house and your neighbours have cockroaches they are not going to treat then you may end up having to treat them multiple times while wondering why they keep coming back. This can go on forever, especially in apartment buildings where people are so close together that if one of them gets cockroaches, everyone gets them. There are a lot of complexities and treating cockroaches is more complex than just spraying a bug. Where you live, the population of the area and the wealth of the neighbourhood all have an effect. So if you are not a millionaire living in malibu you will have to deal with neighbours getting infestations that pass over to you. This can be both from owning an apartment, an attached house or even just being very close to your neighbour’s home. Either way, dealing with something that is coming from their home to yours is much harder to control and exterminate. For this reason, you will want to get a professional treatment that can be as efficient as possibly and you will likely need to do it on a yearly or even monthly basis to keep it constrained. The danger of a neighbour who will not treat their pest issue is great and while contacting the health department may work for some things at the end of the day their home is their own and what they live with whether it be cockroaches, mice or a raccoon in their attic is their choice. All you can do is take preventative measures and call a professional to deal with your side of the situation.